Walter Cook, III v. Scott Kernan ( 2020 )


Menu:
  •                FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    WALTER JOSEPH COOK III,                 No. 17-17257
    Petitioner-Appellant,
    D.C. No.
    v.                      3:15-cv-06343-
    WHA
    SCOTT KERNAN,
    Respondent-Appellee.          OPINION
    Appeal from the United States District Court
    for the Northern District of California
    William Alsup, District Judge, Presiding
    Argued and Submitted March 27, 2019
    San Francisco, California
    Filed January 21, 2020
    Before: Consuelo M. Callahan, N. Randy Smith,
    and Mary H. Murguia, Circuit Judges.
    Opinion by Judge Callahan;
    Concurrence by Judge Callahan;
    Dissent by Judge Murguia
    2                       COOK V. KERNAN
    SUMMARY *
    Habeas Corpus
    The panel affirmed the district court’s denial of Walter
    Joseph Cook, III,’s 
    28 U.S.C. § 2254
     habeas corpus petition
    challenging his California state conviction for three counts
    of first-degree murder, in an appeal in which Cook claimed,
    inter alia, that the state’s reliance on his confession
    prejudicially violated his constitutional rights.
    Cook asserted that his statements to police were
    unlawfully obtained in two ways: that he was unable to
    understand his Miranda rights from the outset of his
    interrogation and thus did not knowingly and intelligently
    waive them, and that his confessions were coerced based on
    the totality of the circumstances as established by the
    existing record.
    Applying AEDPA deference, the panel held that:
    •   based on the facts that Cook was repeatedly warned
    of his Miranda rights, expressly acknowledged the
    warnings, and offered coherent and knowing answers
    to the officers’ questions, the California Supreme
    Court had a reasonable basis to reject Cook’s
    challenge to the validity of his Miranda waiver.
    •   the California Supreme Court had a reasonable basis
    to conclude that Cook’s confession was voluntary
    *
    This summary constitutes no part of the opinion of the court. It
    has been prepared by court staff for the convenience of the reader.
    COOK V. KERNAN                        3
    because Cook fails to show how this conclusion
    under the totality of the circumstances is
    “inconsistent with the holding in a prior decision of
    the [United States] Supreme Court.”
    The panel held that Cook is not entitled under AEDPA
    to an evidentiary hearing into his allegation that an officer
    threatened him at gunpoint during his interview, and that the
    district court did not abuse its discretion in denying his
    request for one, because his failure to develop the factual
    basis for the claim in state court proceedings was due to his
    own lack of diligence.
    The panel addressed remaining claims in a concurrently
    filed memorandum disposition.
    In a concurring opinion, Judge Callahan wrote that if the
    panel had needed to reach the question of whether Cook was
    prejudiced by the admission of his statements, she would
    agree with the district court that the California Supreme
    Court could have reasonably denied Cook’s claim on the
    ground that any error was harmless.
    Dissenting, Judge Murguia disagreed with the majority’s
    conclusion that the California Supreme Court could have
    reasonably denied habeas relief on the basis that Cook
    (1) knowingly and intelligently waived his Miranda rights;
    and (2) suffered no prejudice from the improper admission
    of his unlawfully obtained confession and other
    incriminating statements.
    4                     COOK V. KERNAN
    COUNSEL
    Cormac Early (argued), Jones Day, Washington, D.C.; Craig
    Stewart and Kelsey Israel-Trummel, Jones Day, San
    Francisco, California; for Petitioner-Appellant.
    Sarah J. Farhat (argued), Deputy Attorney General; Peggy S.
    Ruffra, Supervising Deputy Attorney General; Jeffrey M.
    Laurence, Senior Assistant Attorney General; Xavier
    Becerra, Attorney General; Office of the Attorney General,
    San Francisco, California; for Respondent-Appellee.
    OPINION
    CALLAHAN, Circuit Judge:
    In 1994, a California jury convicted petitioner, Walter
    Joseph Cook, III, of three counts of first-degree murder,
    along with a special circumstance of multiple murders under
    California law, and sentenced him to death. Following his
    state habeas proceeding over a decade later, Cook’s sentence
    was reduced to life without the possibility of parole on the
    ground that he was intellectually disabled within the
    meaning of Atkins v. Virginia, 
    536 U.S. 304
     (2002). Cook
    subsequently sought federal habeas relief from his
    conviction on multiple grounds. The district court denied his
    habeas petition but granted a certificate of appealability as to
    four issues, only one of which we address in this opinion:
    whether the state’s reliance on Cook’s taped confession
    COOK V. KERNAN                            5
    resulted in a prejudicial violation of his constitutional
    rights. 1
    Cook’s claim is subject to review under the
    Antiterrorism and Effective Death Penalty Act of 1996
    (“AEDPA”), 
    28 U.S.C. § 2254
    (d). Applying the AEDPA
    standard of review, we deny relief because the state habeas
    court could have reasonably concluded that Cook’s
    confession was not obtained in violation of his constitutional
    rights.
    I.
    A.
    Cook’s convictions emerge from three murders that
    occurred over the span of four months in 1992 in East Palo
    Alto, California, where Cook was a local dealer of crack
    cocaine. 2
    The murder of Earnest Sadler occurred in the early
    morning of February 9, 1992. Around 4:00 a.m., police
    found Sadler’s body lying on the pavement in a residential
    neighborhood in East Palo Alto. Sadler’s head was severely
    battered, and three bloodstained and broken pieces of
    wooden board were found nearby. Sadler’s distinctive shoe
    prints were also visible on the damp soil in the front yard of
    a nearby house. When officers initially interviewed the
    1
    We address Cook’s remaining claims in a concurrently filed
    memorandum disposition.
    2
    The facts and evidence presented at trial in support of Cook’s
    convictions are detailed at length in the California Supreme Court’s
    opinion on direct review, People v. Cook, 
    139 P.3d 492
     (Cal. 2006).
    6                     COOK V. KERNAN
    eleven occupants of the residence, none admitted to having
    seen Sadler killed.
    It was only months later that several occupants of the
    house and other witnesses admitted that they knew Cook had
    beaten Sadler to death. Shawnte Early (who had been
    Cook’s girlfriend at one point) told police that she saw Cook
    beating Sadler with a stick while Sadler was on the ground,
    and that she tried to intervene by coaxing Cook into her car
    and driving him around the corner, only to have Cook jump
    out of her car and resume his brutal attack on Sadler. At trial,
    Early repudiated her taped interview, which was played for
    the jury. Earnest Woodward, a resident of 2250 Menalto,
    testified that he woke up that night to see Cook engaged in a
    fistfight with Sadler, and Woodward told the combatants to
    move down the street. Velisha Sorooshian testified that she
    was sitting with Leonard Holt in her car, smoking a pipe of
    crack cocaine, near 2250 Menalto that night when Cook
    pulled alongside her and laughingly asked her to see if the
    man lying in the street was all right. Shannon Senegal
    (Cook’s cousin) testified that, the day after Sadler’s death,
    Cook told him he had “beat someone down last night” and
    identified his victim as Sadler. Woodward and Senegal were
    either in custody or serving prison sentences at the time of
    trial, and Sorooshian also had a criminal record.
    The murder of Michael Bettencourt occurred sometime
    between midnight and 1:00 a.m. on February 14, 1992. A
    group of drug dealers and friends was gathered on a
    residential street in East Palo Alto, which was known as a
    site for illegal drug sales. Bettencourt, an outsider
    apparently wanting to buy drugs, arrived in the middle of the
    street in his gold Thunderbird car and was immediately
    surrounded by potential sellers, including Cook. Steven
    Sims (another seller) stuck his arm through the open driver-
    COOK V. KERNAN                        7
    side window, but was jostled, causing him to drop his rock
    of cocaine inside Bettencourt’s car. When Sims opened the
    driver’s door to look for the fallen rock, he heard Cook—
    who was standing behind him, holding a nine-millimeter
    automatic pistol—tell Bettencourt to return the rock or pay
    for it. Sims then heard Cook yell, “Get back, get back,” and
    when Sims stepped away, he saw Cook shoot Bettencourt
    once in the leg, pause, then unload the “clip in the nine,”
    shooting Bettencourt repeatedly.
    Once he stopped shooting, Cook jumped into Nathan
    Gardner’s car and rode for a few blocks before he got out.
    During the short ride, Gardner asked Cook why he shot
    Bettencourt, and Cook said it was because Bettencourt had
    tried to “gaffle”—meaning to steal from—him. The next
    day or so, when Sims encountered Cook again and asked
    about the shooting, Cook replied that Bettencourt “should
    have give[n] me my money or my rock back.” Bettencourt
    was found by police, dead in his car, with the driver’s door
    open. The responding officer was unable to obtain
    information from anyone in the neighborhood about the
    shooting. Numerous shell casings were found in the street
    next to the car door, and a later forensic examination
    determined that eleven of the shell casings had come from a
    single gun.
    The murder of Ronald Morris occurred on the afternoon
    of May 21, 1992. Cook, Senegal, and Lavert Branner were
    hurriedly leaving the parking lot of University Liquors in a
    Nova car (driven by Senegal) when they passed Sharoon
    Reed and three of her friends, who were also leaving the
    parking lot in their car. One of the men in the Nova told the
    women to “hurry up and move,” and as the women slowed
    their car to let the Nova pass, Cook displayed a gun to them.
    The women followed the Nova at a distance as they headed
    8                     COOK V. KERNAN
    to a birthday party on East O’Keefe Street in honor of their
    friend, Morris, also known as “Fat Man.”
    When the cars arrived on East O’Keefe, Morris had just
    parked his car and hailed down the Nova. Senegal made a
    U-turn and pulled the Nova next to Morris. As Senegal
    began talking to Morris, Cook (who was in the front
    passenger seat) suddenly leaned across Senegal and fired
    multiple shots at Morris, announcing, “I told you I will get
    your punk ass back.” According to Senegal, Cook harbored
    a grudge against Morris based on an incident about a week
    earlier, when an armed Morris had mocked Cook for being
    unarmed. Reed testified that, from her viewpoint in the
    women’s car, she overheard Morris say, “Damn, you all
    strapped,” as he looked into the Nova, and then saw him
    suddenly turn away just before multiple shots were fired.
    According to a pathologist at trial, Morris had five bullet
    wounds in his heart and lungs, any one of which was
    “potentially fatal.”     Various nine-millimeter cartridge
    casings were recovered from the pavement where Morris
    fell, and were later compared to the nine-millimeter casings
    recovered from the Bettencourt murder. A San Mateo
    County Sheriff's criminalist testified that he could not
    determine with certainty whether both sets of casings had
    come from the same weapon, possibly because those from
    the earlier killing were aluminum while those from the later
    killing were brass. A day after the Morris murder, Cook
    threw his gun off the Dumbarton bridge and subsequently
    left the area.
    B.
    On June 26, 1992, Cook was arrested at his mother’s
    home in Lawton, Oklahoma, on a California warrant. He
    was transported to the local jail, where he was interviewed
    COOK V. KERNAN                                9
    by East Palo Alto Police Sergeant Gregory Eatmon and
    Inspector Bruce Sabin of the San Mateo District Attorney’s
    Office. The interview lasted approximately seven hours,
    from around 7:00 p.m. that night to around 2:00 a.m. the next
    morning.
    At the beginning of the interview, Inspector Sabin read
    Cook his Miranda rights and then asked, “Do you
    understand that Walter?” Cook responded, “Yeah.” Sabin
    then asked, “Okay. Do you have any questions about that?
    That’s a yes or no,” to which Cook responded, “No.” After
    this confirmation from Cook, the investigators proceeded to
    question Cook about his background, his family, and,
    eventually, his whereabouts on the day of the Morris murder.
    During these first few hours of his videotaped interview,
    Cook generally appeared calm, even conversational at times,
    as he answered the investigators’ questions; at other times,
    he also seemed slightly confused, and his responses seemed
    unfocused and difficult to follow. 3 When the investigators
    began to question Cook about Morris, Cook initially
    maintained that he was at his cousin’s house the night of the
    murder and only heard about it after the fact.
    Almost two hours into the interview, around 8:57 p.m.,
    the investigators shifted their approach to a more direct
    verbal confrontation about the Morris murder. They told
    3
    When asked for his date of birth and age at the start of the
    investigation, Cook stated that his birthdate was September 25, 1971
    (which would have made him twenty years old), but then stated he was
    nineteen years old when asked for his age. When Sabin pointed out the
    inconsistency between his responses, Cook responded with, “that’s what,
    what my mother told me, so.” The district court interpreted this colloquy
    as one of the first “signs that Cook was either seriously confused, or
    otherwise mentally incompetent.” Cook was actually eighteen years old
    at the time of his interview.
    10                    COOK V. KERNAN
    Cook, “[E]verything you been giving us up till now has been
    bullshit,” and claimed they had multiple witnesses,
    fingerprint evidence, and shell casings all pinning him to the
    murder. In an effort to persuade Cook to confess, the
    investigators made statements such as: “[N]ow’s the time for
    you to tell the truth son, the absolute truth”; “If Fat Man did
    something to you that made you shoot him, we want to hear
    that”; and, “[N]ot only you’re going to look like a killer, but
    you’re going to look like a liar on top of it.” Cook responded
    to these statements with mostly one-word responses,
    eventually telling the investigators, “I really can’t say too
    much about it ‘cause um, I’m not going to endanger my
    family’s life.” The investigators continued to insist that
    Cook “tell the truth,” until Cook finally stated:
    I don’t, anything I say would endanger my
    family life, I’d rather just, whatever’s going
    to happen to me is going to happen anyway.
    I’m either being . . . you know what I’m
    saying, if you got all this evidence on me,
    either way, I’d say whatever, yes or no, yes
    or no, I’ll either get the electric chair, 25 to
    life, so, you know what I’m saying, it didn’t,
    it really shouldn’t even matter what I say.
    At this point, Cook had not explicitly admitted to
    shooting Morris, but the investigators continued to ask him
    why he killed Morris and whether it was because Morris had
    threatened him. Their questioning led Cook to discuss
    various incidents where he had felt threatened by or
    experienced conflict with Morris. Around 9:34 p.m., in
    response to the investigator’s prompting, “[N]ot only is
    [Morris] disrespecting you, but he’s threatening you for no
    reason, you didn’t do anything to him, did you? Did you
    ever do anything to him?,” Cook began to cry, replying, “No,
    COOK V. KERNAN                            11
    I never do nothing to nobody, I try to be everybody friend. I
    can’t work ‘cause I live on another part.” As Sabin
    continued to question Cook about the Morris shooting, Cook
    tearfully reiterated his fears about endangering his family,
    making statements such as: “I’m in for it regards if I say
    something or not . . . if I tell you something, then, put my
    family life in danger, I’d rather something just happen to
    me”; “It shouldn’t really matter, whatever I say now, you
    said I’m guilty . . . you got all this stuff that I’m in it, so . . .
    regardless of what I say, you know what I’m saying, it’s not
    going to happen . . . if you all plan on killing me or whatever
    . . . I’m doing electric chair or 25 to life . . . it just don’t
    matter now”; “And then, after I tell you all the truth,
    whatever it is, who, you know what I’m saying, I got to face
    the consequences of what happened to, what if somebody
    kill my father and them.”
    At one point, Sabin asked Cook, “[A]re you telling us
    you didn’t shoot this guy, is that what you’re saying?,” and
    Cook answered, “I didn’t say I did or I didn’t.” Sabin and
    Eatmon emphasized again all the evidence they had linking
    Cook to the murder, and told Cook he only needed to explain
    his motive. Cook finally responded, “The only thing I can
    tell you, what the truth is, I remember, the last thing I
    remember, he came up to the car and he, I forgot what he
    said, and last thing I just like blanked out, that’s the last thing
    I remember.” As the investigators pressed Cook for
    additional detail, Cook admitted that he was in the car with
    Branner and Senegal and had a gun with him, but continued
    to maintain that he could not remember what happened after
    Morris approached the car because he “blank[ed] out.”
    Cook did not provide substantially more information
    after this admission, despite continued questioning over the
    next two hours. At one point, Sabin expressed frustration
    12                        COOK V. KERNAN
    with Cook’s responses, stating, “I hate to say this Walter, I
    really do, because we’ve come a long way . . . since when
    you were totally telling us bullshit, okay . . . . But, if you
    were sitting over here, being me, would you believe that?”
    Cook responded, “That’s, that’s what happened, I’m telling
    you, I’m telling you everything that I remember.”
    Around 11:13 p.m., in response to a question about why
    he went to therapy as a child, Cook suddenly began to sob
    loudly and talk about the physical abuse of his mother by his
    father when he was younger. Faced with an increasingly
    emotional Cook, Sabin and Eatmon offered him a drink and
    unsuccessfully tried to reengage him in questions about
    Morris. Instead of responding to questions about Morris,
    however, Cook continued to discuss his abusive childhood,
    while still crying and making statements such as: “I don’t
    care, they can kill me, do whatever they want, I don’t care
    no more”; “I hope they kill me or whatever, I don’t want to
    worry about waking up every night, just thinking about got
    to help my mother, and I can’t do nothing to stop it . . . let
    them kill me, I don’t care, I have nothing to live for, nobody
    even care about me anyway so, I mean, it’s better if I’m
    gone”; “I don’t care what happens to me, kill me, I’d be more
    of a big heavy burden.” By 11:38 p.m., the investigators
    decided to take a break to allow Cook to calm down and
    escorted him back to his cell. 4
    4
    In his state habeas petition, Cook alleged for the first time that,
    during this half-hour break in his interview, Sergeant Eatmon threatened
    him at gunpoint. According to Cook, as Eatmon escorted Cook from his
    cell to the interrogation room, Eatmon pulled Cook into a restroom, held
    a gun to Cook’s head, and threatened to harm him if he did not confess
    to killing Bettencourt. Cook did not offer a sworn affidavit personally
    attesting to this allegation in either his state or federal habeas petition,
    nor do the affidavits from trial counsel in response to his ineffective
    COOK V. KERNAN                            13
    The taped interview resumed around 12:10 a.m. Sabin
    reminded Cook again of his Miranda rights:
    SABIN: Okay, Walter, when we initially
    started this interview we read you your
    Miranda rights, do you remember those?
    COOK: Uh-hum.
    SABIN: Okay. And you still want to talk to
    us is that correct?
    COOK: Yeah, it don’t matter.
    SABIN: Okay. I want you to understand
    that, if at some point in time you don’t want
    to talk to us anymore, say so, okay?
    Understand?
    COOK: Yes.
    SABIN: Okay. If you want us to stop at
    some point in time and take a break, say so
    with [sic] that alright?
    COOK: Uh-hum.
    SABIN: I want you to be totally comfortable
    with this, okay?
    assistance of counsel claims mention this allegation. The California
    Supreme Court denied Cook’s petition without granting his request for
    an evidentiary hearing on this claim.
    14                        COOK V. KERNAN
    COOK: Uh-hum.
    Sabin then began questioning on the Bettencourt murder,
    which led to a somewhat abrupt confession from Cook:
    SABIN: Alright. What we want to talk to
    you about Walter is an incident that happened
    on February 14th, 1992, on Alberni Street.
    Alberni near Jervis, do you have any idea
    what I’m talking about?
    COOK: Uh-hum.
    SABIN: Okay. Do you want to tell me what
    you know about it?
    COOK: Yeah, I did it, I actually don’t know
    why. And that’s all you need to know. Well,
    I don’t care.
    Sabin pressed for more information, but Cook declined to
    provide additional detail, asserting that he could not
    remember or did not know what happened, but knew that he
    committed the shooting. 5 The questioning continued until
    about 1:42 a.m., when Eatmon gave Cook a glass of water
    and aspirin at Cook’s request, and Sabin left to use the
    restroom. Around 1:50 a.m., after Cook began coughing up
    5
    Cook’s responses to various questions included: “Well, the whole
    plan is, everyone know that I did it or not, I did it so, you all can just
    shoot me or whatever, it don’t matter.”; “Well, I don’t really know. The
    only thing I know that I, I shot the dude, that’s all I know.”; “I don’t, I
    don’t know what happened. Last thing I remember, I know I shot the
    guy, that’s all I remember happening.”; “No, I don’t remember nothing.
    The only thing, the only thing I remember, I know I shot the dude, that’s
    all I remember.”
    COOK V. KERNAN                        15
    his aspirin, the investigators decided to terminate the
    interrogation for the night.
    The interview resumed the next day around 12:49 p.m.
    Sabin again asked Cook if he remembered “the Miranda
    rights I read to you yesterday when we first met?” Cook
    answered, “Um, not really.” Sabin then reread the Miranda
    rights to Cook and asked if he had any questions. Cook
    responded, “So, therefore that um, like, when you all talk to
    me I’m supposed to have an attorney here or something?”
    Sabin answered, “No, you have the right to have one here if
    you want,” which prompted this exchange:
    COOK: Is that the only time you could have
    an attorney to be able, when you go to court?
    SABIN: You can have an attorney present
    any time during these, these proceedings.
    COOK: I didn’t know that.
    SABIN: Okay, well, do you remember me
    reading that off to you yesterday?
    COOK: Not really, but I remember you was
    reading something about my rights.
    Cook then told the investigators he wanted to talk to his
    mother before he continued speaking with them. Sabin
    asked Cook a few more questions as to whether he
    understood his rights the day before. Cook answered, “No,
    I, I didn’t know that . . . you could have a lawyer . . . while
    you guys talk to me. I didn’t know that,” “I remember you
    telling me that I didn’t, like to remain silent,” and “Yeah, I
    thought I did [understand], but I guess I didn’t, I didn’t know
    16                       COOK V. KERNAN
    that like, when you guys talked to me that, I could have a
    lawyer here.”
    After Cook was given an opportunity to talk to his
    mother, he returned to the interview at 6:20 p.m. and
    informed the investigators he did not want to talk to them
    because his mother “told me I should wait till I get back to
    California, we got to talk to my lawyer.” The officers
    subsequently ended the interview. 6
    C.
    At the time of his arrest and interview, Cook was
    eighteen years old. According to Dr. William Lynch, a
    neuropsychologist who evaluated Cook prior to trial, Cook’s
    “full scale” IQ was 89 and his intelligence was “low average
    overall . . . with verbal and performance abilities falling at
    the extreme low end of the average range.” Dr. Zakee
    Matthews, a clinical psychologist who also evaluated Cook
    prior to trial, opined that Cook suffered from PTSD. Neither
    Dr. Lynch nor Dr. Matthews reviewed the transcripts or
    videotape of Cook’s interrogation as part of their pre-trial
    evaluations.
    Over a decade later, at the request of Cook’s state habeas
    counsel, Dr. Matthews reviewed Cook’s videotaped
    interview and opined that “it was extremely unlikely
    Mr. Cook could have meaningfully understood the
    admonition regarding his legal rights as expressed in the
    language and manner used by the interrogating officers.”
    6
    On June 30, 1992, Cook submitted to another interview with two
    different detectives from the San Mateo County Sheriffs’ Office, during
    which he confessed to killing Earnest Sadler. Cook was not read his
    Miranda warnings at this interview, and these statements pertaining to
    Earnest Sadler were not used at trial.
    COOK V. KERNAN                         17
    According to Dr. Matthews, “Cook’s spontaneous questions
    and comments . . . confirm that he did not have an adequate
    comprehension of his rights necessary to make a knowing
    and intelligent waiver.”
    In 1992, Dr. George Wilkinson was retained by the
    defense team to perform a forensic pretrial evaluation of
    Cook, which included a review of the audiotaped recordings
    and “a half-hour videotape” of the interrogation. In his
    pretrial evaluation, Dr. Wilkinson concluded that Cook “had
    life-long attentional and learning disabilities that reduced his
    performance even below his measured intelligence level of
    borderline to low average.” He also noted “a pattern of
    deficits affecting memory and information-processing that
    rendered Mr. Cook vulnerable, particularly when under
    stress, to becoming overwhelmed and confused. Individuals
    with such impairments are dependent upon cues and
    guidance from others to maintain a useful and functional
    organization of information.” In 2005, at the request of state
    habeas counsel, Dr. Wilkinson reviewed additional material
    and rendered an updated opinion that, had he been asked to
    do so at trial, he would have opined that “the circumstances
    of     the      interrogation,   including       Mr.     Cook’s
    neuropsychological and intellectual impairments and the
    effects of his trauma-based symptoms, prevented him from
    knowingly and intelligently understanding and waiving his
    right to remain silent.”
    Two other mental health experts also evaluated Cook
    years after trial and provided declarations in support of his
    2005 state habeas petition. Dr. Myla Young concluded that
    Cook’s full scale IQ was 83 with a “level of performance . . .
    similar to that demonstrated by most children with an age
    equivalence of 9.9 years.” Based on her testing, Dr. Young
    concluded that “the impairments that Mr. Cook
    18                   COOK V. KERNAN
    demonstrates in 2004 would have been present at the time of
    the offenses and his trial,” and noted that her conclusions
    were “consistent with those reported by Dr. Lynch in 1994.”
    Dr. George Woods provided an extensive report in 2005,
    stating that
    [Cook] is easily distracted by external stimuli
    and internal dialogue, cannot inhibit
    impulsive response selection or retrieve
    information     accurately,     and     readily
    incorporates cues, prompting and direction
    from others into his strategies for recalling
    information. Under the best of circumstances
    these cognitive deficits render Mr. Cook
    vulnerable      to      suggestibility     and
    confabulation, i.e., adopting a created or
    suggested memory to fill a void where only
    partial or no memory exists.
    Dr. Woods further opined that “Cook’s repeated inability
    spontaneously to offer details of events, to confidently
    confirm or deny suggested details or to indicate other than a
    lack of memory for events are strong indications that
    independent recollection was not accessible to him.”
    According to Dr. Woods, “The methods of interrogation and
    Mr. Cook’s evolving acquiescence in acknowledging
    possible, probable, or even actual involvement in the
    offenses are accompanied by so many symptomatic signs of
    dissociation and confabulation, the videotape could serve as
    a didactic instrument for permitting clinicians to observe the
    psychological dynamics that might lead to a false
    confession.”
    COOK V. KERNAN                        19
    D.
    At Cook’s trial in 1994, the prosecution presented
    multiple witnesses linking Cook to each murder, ballistics
    evidence, and medical evidence, as well as Cook’s taped
    confession to the Bettencourt and Morris murders. The jury
    convicted Cook of three counts of first-degree murder in
    violation of California Penal Code § 187, with a special
    allegation of multiple murders under California Penal Code
    § 190.2(a)(3), amongst other offenses. A month later, the
    jury returned a death verdict. In August 2006, the California
    Supreme Court issued its opinion on direct appeal and
    affirmed Cook’s convictions and death sentence in full.
    People v. Cook, 
    139 P.3d 492
     (Cal. 2006).
    In August 2005, while his appeal was still pending
    review, Cook filed a habeas petition with the California
    Supreme Court, raising seventeen claims, which included his
    claim that the state’s reliance on his confession violated his
    constitutional rights. The petition also raised a number of
    new factual allegations, including the allegation that
    Sergeant Eatmon had threatened Cook at gunpoint during the
    interview, and requested an evidentiary hearing into the
    allegations.
    On December 15, 2010, the California Supreme Court
    issued its one-page decision on Cook’s habeas petition. The
    California Supreme Court first ordered the Director of the
    Department of Corrections and Rehabilitation to “show
    cause in the San Mateo County Superior Court . . . why
    petitioner’s death sentence should not be vacated and
    petitioner sentenced to life without the possibility of parole
    on the ground that he is mentally retarded within the
    meaning of Atkins v. Virginia . . . .” It then summarily
    denied “[a]ll of the remaining claims in the petition . . . on
    the merits.” The California Supreme Court also invoked
    20                        COOK V. KERNAN
    procedural bars for a number of Cook’s claims, including the
    claim that “his statements to police were obtained in
    violation of his constitutional rights.”
    In November 2014, the San Mateo County Superior
    Court found that Cook met diagnostic criteria for intellectual
    disability within the meaning of Atkins, 
    536 U.S. 304
    ,
    vacated the death sentence, and resentenced Cook to life in
    prison without the possibility of parole.
    In December 2015, Cook filed his federal habeas petition
    with the district court, raising seven claims, each of which
    had been previously raised in his state habeas petition. Cook
    also moved the district court for an evidentiary hearing to
    look “into all disputed issues of fact material to his Petition
    for Habeas Corpus,” including his claim that Sergeant
    Eatmon threatened him at gunpoint into confessing to the
    Bettencourt murder.
    The district court denied Cook’s habeas petition. It
    denied Cook’s motion for an evidentiary hearing because
    “[a]ll issues presented by his petition can be resolved on the
    record” and “[o]ther allegations would not entitle Cook to
    relief even if proven true. . . .” In regard to Cook’s claims
    pertaining to his statements to police, the district court
    concluded that Cook’s Miranda waiver was not knowing and
    intelligent, 7 but the admission of the confession at trial was
    7
    According to the district court, “[g]iven substantial evidence of
    [Cook’s] inability to comprehend his rights, including his youth, low IQ,
    psychological deficiencies, inability to follow verbal instructions,
    dissociation, and his statements to interrogators that he did not
    understand he had the right to have a lawyer present at his interrogation,
    a contrary conclusion is unreasonable.”
    COOK V. KERNAN                             21
    not prejudicial because the remaining evidence still
    supported the Morris and Bettencourt murder convictions. 8
    II.
    This court reviews de novo the district court’s denial of
    habeas relief. Murray v. Schriro, 
    882 F.3d 778
    , 801 (9th Cir.
    2018).
    As amended by AEDPA, 
    28 U.S.C. § 2254
    (d) requires
    “highly deferential” review of state court adjudications,
    “demand[ing] that state-court decisions be given the benefit
    of the doubt.” Woodford v. Visciotti, 
    537 U.S. 19
    , 24 (2002)
    (per curiam) (quoting Lindh v. Murphy, 
    521 U.S. 320
    , 333
    n.7 (1997)). A federal court’s authority to grant habeas relief
    is limited to instances where the state court’s ruling was
    (1) “contrary to, or involved an unreasonable application of,
    clearly established Federal law, as determined by the
    Supreme Court of the United States” at the time the state
    court adjudicated the claim on the merits, 
    28 U.S.C. § 2254
    (d)(1), or (2) “based on an unreasonable
    determination of the facts in light of the evidence presented
    at the State court proceeding.” 
    Id.
     § 2254(d)(2).
    The “contrary to” and “unreasonable application”
    clauses of § 2254(d)(1) have independent meaning.
    Williams v. Taylor, 
    529 U.S. 362
    , 405 (2000). A state
    court’s decision is “contrary to” clearly established federal
    law if it “applies a rule that contradicts the governing law set
    forth in [Supreme Court] cases” or if it “confronts a set of
    facts that are materially indistinguishable from a decision of
    8
    Having found a Miranda violation, but no prejudice, the district
    court declined to reach the question of whether Cook’s confession was
    involuntary.
    22                    COOK V. KERNAN
    [the Supreme] Court and nevertheless arrives at a result
    different from [this] precedent.” 
    Id.
     at 405–06.
    A state court’s decision is an “unreasonable application”
    of clearly established federal law if it “correctly identifies
    the governing legal rule but applies it unreasonably to the
    facts of a particular prisoner’s case.” 
    Id.
     at 407–08. “The
    ‘unreasonable application’ clause requires the state court
    decision to be more than incorrect or erroneous”; it must be
    “objectively unreasonable.” Lockyer v. Andrade, 
    538 U.S. 63
    , 75 (2003) (quoting Williams, 
    529 U.S. at 410
    ); see also
    Schriro v. Landrigan, 
    550 U.S. 465
    , 473 (2007) (“The
    question under AEDPA is not whether a federal court
    believes the state court’s determination was incorrect but
    whether that determination was unreasonable—a
    substantially higher threshold.”) (citing Williams, 
    529 U.S. at 410
    ). In other words, “[a]s a condition for obtaining
    habeas corpus [relief] from a federal court, a state prisoner
    must show that the state court’s ruling on the claim being
    presented in federal court was so lacking in justification that
    there was an error well understood and comprehended in
    existing law beyond any possibility for fairminded
    disagreement.” Harrington v. Richter, 
    562 U.S. 86
    , 103
    (2011).
    Similarly, in regard to claims under § 2254(d)(2), a state
    court’s factual determination is not “unreasonable merely
    because the federal habeas court would have reached a
    different conclusion in the first instance.” Wood v. Allen,
    
    558 U.S. 290
    , 301 (2010). Even if “[r]easonable minds
    reviewing the record might disagree” about a factual finding,
    “on habeas review that does not suffice to supersede” the
    state court’s determination. Rice v. Collins, 
    546 U.S. 333
    ,
    341–42 (2006).
    COOK V. KERNAN                              23
    III.
    Cook claims that the state’s reliance on his confession
    prejudicially violated his constitutional rights, because his
    statements to police were unlawfully obtained in two ways.
    First, Cook asserts he was unable to understand his Miranda
    rights from the outset of his interrogation and thus did not
    knowingly and intelligently waive them. Second, Cook
    alleges that his confessions were coerced based on the
    totality of the circumstances as established by the existing
    record.
    The California Supreme Court summarily denied this
    claim “on the merits.” 9 Despite the state court’s lack of
    explanation for its denial of relief, our review is still subject
    to AEDPA. See Cullen v. Pinholster, 
    563 U.S. 170
    , 187
    (2011) (“Section 2254(d) applies even where there has been
    a summary denial.”).
    Where a state court’s decision is
    unaccompanied by an explanation, the
    habeas petitioner’s burden still must be met
    by showing there was no reasonable basis for
    the state court to deny relief. This is so
    whether or not the state court reveals which
    9
    The California Supreme Court also found this claim procedurally
    barred under In re Seaton, 
    95 P.3d 896
     (Cal. 2004). While this court has
    not yet squarely addressed whether In re Seaton provides an “adequate
    and independent” state procedural rule that bars federal habeas review,
    we need not decide this question given the state’s failure to plead the
    existence of such a bar to Cook’s claim. See Bennett v. Mueller, 
    322 F.3d 573
    , 586 (9th Cir. 2003). In fact, at oral argument, the state expressly
    asserted that no procedural bar applies to this claim. Accordingly, we
    consider any procedural bar waived and proceed to review the merits of
    Cook’s claims regarding the validity of his Miranda waiver and the
    voluntariness of his confession under the AEDPA standard.
    24                   COOK V. KERNAN
    of the elements in a multipart claim it found
    insufficient, for § 2254(d) applies when a
    ‘claim,’ not a component of one, has been
    adjudicated.
    Richter, 
    562 U.S. at 98
    . Thus, in reviewing the California
    Supreme Court’s summary denial of Cook’s claim, we must
    determine: (1) “what arguments or theories supported or . . .
    could have supported . . . the state court’s decision”; and
    (2) “whether it is possible fairminded jurists could disagree
    that those arguments or theories are inconsistent with the
    holding in a prior decision of [the Supreme] Court.” 
    Id. at 102
    . Given this deferential standard, Cook is not entitled
    to federal habeas relief on his claim because fairminded
    jurists could disagree as to whether Cook’s confession was
    obtained in violation of his constitutional rights.
    A.
    Before proceeding with a custodial interrogation, a
    suspect must be advised of his Miranda rights: that he “‘has
    the right to remain silent, that anything he says can be used
    against him in a court of law, that he has the right to the
    presence of an attorney, and that if he cannot afford an
    attorney one will be appointed for him prior to any
    questioning if he so desires.’” Dickerson v. United States,
    
    530 U.S. 428
    , 435 (2000) (quoting Miranda v. Arizona,
    
    384 U.S. 436
    , 479 (1966)); see also Berghuis v. Thompkins,
    
    560 U.S. 370
    , 380 (2010). A suspect’s waiver of these rights
    is valid only if it is “voluntary, knowing and intelligent.”
    Miranda, 
    384 U.S. at 479
    . Thus, the waiver inquiry “has two
    distinct dimensions”—first, it must be “voluntary in the
    sense that it was the product of a free and deliberate choice
    rather than intimidation, coercion, or deception,” and
    second, it must be “made with a full awareness of both the
    COOK V. KERNAN                        25
    nature of the right being abandoned and the consequences of
    the decision to abandon it.” Thompkins, 
    560 U.S. at
    382–83
    (quoting Moran v. Burbine, 
    475 U.S. 412
    , 421 (1986)). A
    waiver satisfies this two-part standard only “if the ‘totality
    of the circumstances surrounding the interrogation’ reveal
    both an uncoerced choice and the requisite level of
    comprehension.” Burbine, 
    475 U.S. at 421
     (quoting Fare v.
    Michael C., 
    442 U.S. 707
    , 725 (1979)).
    On the night of Cook’s arrest and initial interview, he
    was advised by police of his Miranda rights—three times in
    fact. Each time, Cook readily affirmed that he understood
    his rights and wanted to speak anyway, and did so without
    any apparent form of intimidation, coercion, or deception
    from the investigators providing the warnings. Each time
    the investigators read or reminded Cook of his Miranda
    rights during the interview, they also followed up with
    additional questions to ensure that Cook understood the
    rights he was read and wanted to waive them and proceed
    with the questioning, which—from at least an objective
    vantage point—Cook did. In that respect, the record
    supports the conclusion that Cook’s Miranda waiver was
    voluntary.
    However, the mere fact “that a Miranda warning was
    given and the accused made an uncoerced statement, . . .
    standing alone, is insufficient to demonstrate ‘a valid
    waiver’ of Miranda rights.” Thompkins, 
    560 U.S. at 384
    (quoting Miranda, 
    384 U.S. at 475
    ). “The prosecution must
    make the additional showing that the accused understood
    these rights[,]” 
    id.,
     meaning that his waiver was also
    knowing and intelligent. “The determination of whether
    there has been an intelligent waiver . . . must depend, in each
    case, upon the particular facts and circumstances
    surrounding that case, including the background, experience,
    26                   COOK V. KERNAN
    and conduct of the accused.” Johnson v. Zerbst, 
    304 U.S. 458
    , 464 (1938). Here, the record evidence contains some
    indication that Cook did not understand his right to have an
    attorney present during his interrogation—and thus did not
    knowingly and intelligently waive this particular right.
    These factors include: the weight of the mental health
    evidence regarding his cognitive inability to understand the
    rights warnings; the occasional indications of his confusion
    or lack of comprehension during the interview; and the
    statements he made on the second day of his interview, when
    he questioned whether he could have a lawyer present and
    asserted that he did not previously understand this right.
    At the same time, “[t]he Constitution does not require
    that a criminal suspect know and understand every possible
    consequence of a waiver of the Fifth Amendment privilege.
    The Fifth Amendment’s guarantee is both simpler and more
    fundamental: A defendant may not be compelled to be a
    witness against himself in any respect.” Colorado v. Spring,
    
    479 U.S. 564
    , 574 (1987). The totality of Cook’s conduct,
    particularly on the first day of his interview, as well as his
    background and experience, support the conclusion that
    Cook fundamentally understood his Fifth Amendment
    rights. Cook had been arrested and been provided Miranda
    warnings on several occasions in the past, which the
    investigators confirmed at the beginning of the interview.
    And throughout much of the interview, Cook was able to
    respond coherently to the investigators’ questions. Based on
    these factors, the government’s alternative interpretation of
    the circumstances is reasonable: Cook “understood his rights
    and agreed to speak with police without counsel but then
    changed his mind the next day, proffering the self-serving
    COOK V. KERNAN                              27
    excuse that he had not earlier understood his right to
    counsel.” 10
    Under AEDPA’s deferential standard of review, we must
    keep in mind that review of Cook’s habeas action is “not a
    substitute for ordinary error correction through appeal.”
    Richter, 
    562 U.S. at
    102–03. In order to grant relief, we are
    required to find that no fairminded jurist could conclude that
    Cook knowingly and voluntarily waived his Miranda rights.
    Although there are certain facts in the record that may
    support a finding that Cook did not fully and completely
    understand his right to have an attorney present at his
    interrogation, we must give even greater deference under
    AEDPA when determining whether the case-specific
    application of a general standard, such as the “totality of the
    circumstances” test, provides a reasonable basis for a state
    court decision. Based on the facts that Cook was repeatedly
    warned of his Miranda rights, expressly acknowledged the
    warnings, and offered coherent and knowing answers to the
    officers’ questions, the California Supreme Court had a
    reasonable basis to reject Cook’s challenge to the validity of
    his Miranda waiver. 11
    10
    Given these circumstances, the dissent’s assertion that we find
    “one-word verbal affirmations” sufficient to establish that Cook
    understood the rights he was waiving obviously mischaracterizes our
    decision. See Dissent at 48.
    11
    The dissent arrives at a contrary conclusion after conducting what
    appears to be its “own independent inquiry into whether the state court
    was correct as a de novo matter” under the guise of AEDPA review.
    Yarborough v. Alvarado, 
    541 U.S. 652
    , 665 (2004). It is emphatically
    not the role of a federal habeas court to “issue the writ simply because
    that court concludes in its independent judgment that the state-court
    decision applied [the law] incorrectly.” 
    Id.
     (quoting Woodford v.
    Visciotti, 
    537 U.S. 19
    , 24–25 (2002) (per curiam)).
    28                   COOK V. KERNAN
    B.
    We next address the voluntariness of Cook’s confession.
    An involuntary or coerced confession is inadmissible at trial,
    Lego v. Twomey, 
    404 U.S. 477
    , 478 (1972), because its
    admission is a violation of a defendant’s right to due process
    under the Fourteenth Amendment, Jackson v. Denno,
    
    378 U.S. 368
    , 385–86 (1964). A confession is involuntary
    if it is not “‘the product of a rational intellect and a free
    will.’” Medeiros v. Shimoda, 
    889 F.2d 819
    , 823 (9th Cir.
    1989) (citation omitted). A “necessary predicate” to finding
    a confession involuntary is that it was produced through
    “coercive police activity.” Colorado v. Connelly, 
    479 U.S. 157
    , 167 (1986). Coercive police activity can be the result
    of either “physical intimidation or psychological pressure.”
    Townsend v. Sain, 
    372 U.S. 293
    , 307 (1963). Whether a
    confession is involuntary must be analyzed within the
    “totality of [the] circumstances.” Withrow v. Williams,
    
    507 U.S. 680
    , 693 (1993). “The factors to be considered
    include the degree of police coercion; the length, location
    and continuity of the interrogation; and the defendant’s
    maturity, education, physical condition, mental health, and
    age.” Brown v. Horell, 
    644 F.3d 969
    , 979 (9th Cir. 2011)
    (citations omitted).
    Cook argues that the evidence in the existing record
    establishes coercion, highlighting the expert opinions that
    his statements to police were not voluntary based on his
    mental capabilities at the time. Cook likens his situation to
    United States v. Preston, 
    751 F.3d 1008
     (9th Cir. 2014) (en
    banc), where we held that the 38-minute noncustodial
    interview of an eighteen-year old with an IQ of 65 was
    coercive and rendered his confession involuntary. Cook’s
    IQ at the time of his interview ranged between 83 to 89,
    which is notably higher than Preston’s. However, other
    COOK V. KERNAN                        29
    aspects of Cook’s interrogation are comparable to Preston’s,
    such as their similar age and some of the descriptions of their
    mental attributes—i.e., “easily confused” and “highly
    suggestible and easy to manipulate.” 
    Id. at 1022
    . Cook’s
    investigators also employed some of the same interrogation
    techniques that we noted “would be hard for a person of
    Preston’s impaired intelligence to withstand or rationally
    evaluate”—such as “alternative questioning, providing
    suggestive details, and repetitious and insistent questions.”
    
    Id.
     at 1025–26. Moreover, Cook’s custodial interrogation
    also lasted around seven hours—far longer than the
    noncustodial interview in Preston—during which Cook
    became emotional at times and appeared physically
    exhausted by the end. These factors, on de novo review,
    could support the same conclusion we reached in Preston:
    that the “subtle forms of psychological persuasion”
    employed by the investigators were sufficiently coercive to
    overcome Cook’s will. See 
    id. at 1023
     (quoting Connelly,
    
    479 U.S. at 164
    ).
    However, our opinion in Preston is not “clearly
    established” Supreme Court precedent and thus not
    controlling under AEDPA review. See Williams, 
    529 U.S. at 412
     (stating that the phrase “clearly established Federal
    law” in § 2254(d)(1) “refers to the holdings, as opposed to
    the dicta, of [the Supreme] Court’s decisions as of the time
    of the relevant state-court decision”). Moreover, none of the
    Supreme Court cases cited by Cook provide us with a
    “materially indistinguishable” set of facts by which we can
    determine whether the state court’s decision to deny relief in
    Cook’s case ran contrary to clearly established federal law.
    See id. at 405. Nor do we find that the state court’s
    conclusion would be an unreasonable application of clearly
    established federal law to the facts of Cook’s case. Indeed,
    the “totality of the circumstances” test for voluntariness as
    30                    COOK V. KERNAN
    established by the Supreme Court is a fact-based analysis
    that inherently allows for a wide range of reasonable
    application. Since “[a]pplying a general standard to a
    specific case can demand a substantial element of
    judgment,” federal courts must provide even “more leeway”
    under AEDPA in “evaluating whether a rule application was
    unreasonable . . . in case-by-case determinations.”
    Yarborough v. Alvarado, 
    541 U.S. 652
    , 664 (2004); see also
    Richter, 
    562 U.S. at 101
     (applying this greater degree of
    deference in a case where the state court denied habeas relief
    in a one-sentence summary order).
    Given this, Cook utterly fails to show how the conclusion
    that his confession was voluntary under the totality of the
    circumstances is “inconsistent with the holding in a prior
    decision of the Supreme Court.” Richter, 
    562 U.S. at 102
    .
    Cook’s case presents several circumstances that, taken
    together, could reasonably support the finding that his
    confession was voluntary. First, there is the apparent lack of
    blatantly coercive police activity from the videotaped
    interview. Aside from some of the suggestive or “repetitious
    and insistent” questioning we earlier noted, the entire
    interview contains little indication of coercion. In fact, the
    investigators’ interactions with Cook throughout the
    interview appear professional, calm, and even affable at
    times. They did not raise their voices or threaten Cook or
    make explicit promises of leniency for his confession, and
    they offered him breaks, food, and water throughout the
    interview. Second, Cook’s responses, taken as a whole,
    could be reasonably viewed as a deliberate—and largely
    successful—effort on his part to resist the officers’
    interrogation tactics. Throughout the interview, Cook
    manages to evade the officers’ repeated and varied attempts
    to elicit specific admissions and inculpating details about the
    crimes, often by providing non-responsive, diversionary
    COOK V. KERNAN                                31
    answers to their questions. When he does finally “confess,”
    he makes only vague admissions to facts that minimize his
    culpability for the crimes—for instance, his repeated claims
    that he “blanked” out and does not remember actually
    committing the murders.          Third, the circumstances
    surrounding the crimes and Cook’s personal history—such
    as his disposal of the murder weapon and flight to Oklahoma
    after the Morris shooting, as well as his previous arrests and
    experience with law enforcement—suggest that he could
    appreciate the gravity of his situation and his actions and
    could take affirmative measures to minimize or mask his
    guilt.
    In light of the state court record, the California Supreme
    Court had a reasonable basis to conclude that Cook’s
    confession was voluntary.
    C.
    We finally address Cook’s request for an evidentiary
    hearing into his allegation that Sergeant Eatmon threatened
    him at gunpoint during his interview. As evidentiary support
    for his factual claim, Cook cites to the videotaped
    confession, in which he claims he makes indirect references
    to Eatmon’s gunpoint threat, 12 and to his proffered evidence
    “that Eatmon had a reputation for sadistic violence, and a
    documented history of lying and lacking integrity.”
    Although Cook presented this evidence along with a request
    for an evidentiary hearing in his state habeas petition, the
    California Supreme Court summarily denied his petition
    12
    Specifically, Cook points out that, minutes after Eatmon allegedly
    threatened him and the interrogation resumed, he states, “[E]veryone
    know that I did it or not, I did it so, you all can just shoot me or whatever
    it don’t matter.”
    32                    COOK V. KERNAN
    without granting a hearing on this issue. According to Cook,
    because the state court never afforded him an evidentiary
    hearing to develop his claim, its fact-finding process was
    deficient, and this court should review Cook’s claims de
    novo. Alternatively, Cook asks us to “remand to the district
    court for an evidentiary hearing on the allegation against
    Eatmon.” Cook’s arguments essentially raise two separate
    claims: (1) the state habeas court’s failure to make any
    factual findings regarding the alleged gunpoint threat by
    Sergeant Eatmon was, in itself, an “unreasonable
    determination of the facts” under § 2254(d)(2), and (2) Cook
    is otherwise entitled to a federal evidentiary hearing under
    § 2254(e)(2).
    To determine whether a petitioner is entitled to an
    evidentiary hearing under § 2254(e)(2), a court must first
    determine whether a factual basis exists in the record to
    support the petitioner’s claim. Insyxiengmay v. Morgan,
    
    403 F.3d 657
    , 669–70 (9th Cir. 2005) (quoting Baja v.
    Ducharme, 
    187 F.3d 1075
    , 1078 (9th Cir. 1999)). If the
    record contains a sufficient factual basis that “refutes the
    applicant’s factual allegations or otherwise precludes habeas
    relief, a district court is not required to hold an evidentiary
    hearing.” Landrigan, 
    550 U.S. at 474
    ; see Pinholster,
    
    563 U.S. at 171
     (“[A] federal habeas court is ‘not required to
    hold an evidentiary hearing’ when the state-court record
    ‘precludes habeas relief’ under § 2254(d)’s limitations.”)
    (citation omitted). If the factual basis for a claim is
    undeveloped or absent, the next inquiry is whether petitioner
    “failed to develop” these facts in state court proceedings.
    Insyxiengmay, 
    403 F.3d at
    669–70. Only when a petitioner
    demonstrates that he did not fail to develop the factual basis
    for his claim in state court may a federal court proceed to
    consider whether a hearing is appropriate or required under
    the framework set forth in Townsend v. Sain. 
    Id.
    COOK V. KERNAN                        33
    Under this analytical framework, Cook is not entitled to
    an evidentiary hearing. Cook’s failure to develop the factual
    basis for his claim in state court proceedings was due to his
    own lack of diligence. “Under the opening clause of
    § 2254(e)(2), a failure to develop the factual basis of a claim
    is not established unless there is lack of diligence, or some
    greater fault, attributable to the prisoner or the prisoner’s
    counsel.” Williams, 
    529 U.S. at 432
    ; see Baja, 
    187 F.3d at 1078
    . The standard for determining “diligence” is
    whether a petitioner “made a reasonable attempt, in light of
    the information available at the time, to investigate and
    pursue claims in state court.” Williams, 
    529 U.S. at 435
    .
    Absent unusual circumstances, diligence requires “that the
    prisoner, at a minimum, seek an evidentiary hearing in state
    court in the manner prescribed by state law.” 
    Id. at 437
    .
    However, “a petitioner who ‘knew of the existence of []
    information’ at the time of his state court proceedings, but
    did not present it until federal habeas proceedings, ‘failed to
    develop the factual basis for his claim diligently.’” Rhoades
    v. Henry, 
    598 F.3d 511
    , 517 (9th Cir. 2010) (quoting
    Cooper-Smith v. Palmateer, 
    397 F.3d 1236
    , 1241 (9th Cir.
    2005)).
    Cook claims he was diligent simply because he requested
    an evidentiary hearing in his 2005 habeas petition to the
    California Supreme Court but was denied. However,
    Sergeant Eatmon allegedly threatened Cook during his
    interrogation in 1992, which was nearly two years prior to
    his trial. Thus, Cook was aware of the facts underlying this
    claim both prior to trial and long before he first raised it in
    his habeas petition. Cook does not explain whether he
    informed his counsel about this incident, or why this factual
    allegation was not raised at trial or on appeal, except in the
    context of his claim that his trial counsel was ineffective.
    Cook’s counsel did not cross-examine Sergeant Eatmon on
    34                     COOK V. KERNAN
    this alleged threat, nor do they mention the incident in either
    the motion to suppress the confession at trial, or in their 2005
    state habeas affidavits—all of which suggests that Cook’s
    counsel were unaware of Sergeant Eatmon’s alleged threat
    during the interview because Cook never informed them.
    Cook does not assert otherwise, nor does he proffer any
    reason for why he should be absolved of his personal
    responsibility for the diligent pursuit of his claims. Under
    § 2254(e)(2), we may not grant Cook an evidentiary
    hearing—almost three decades after trial in federal habeas
    court—to develop the factual basis of a claim that Cook
    knew of before trial and failed to develop during his state
    proceedings.
    For similar reasons, we also reject Cook’s claim that the
    state habeas court’s denial of an evidentiary hearing into his
    Sergeant Eatmon allegation was, in itself, an “unreasonable
    determination of the facts” under § 2254(d)(2). We view
    Cook’s argument here as essentially an “intrinsic” challenge
    to the state court’s determination of fact under § 2254(d)(2),
    which “may be based on a claim . . . ‘that no finding was
    made by the state court at all,’ when it was required to make
    a finding.” Murray v. Schriro, 
    745 F.3d 984
    , 999 (9th Cir.
    2014) (quoting Taylor v. Maddox, 
    366 F.3d 992
    , 999 (9th
    Cir. 2004)). When performing an intrinsic review, we “may
    only hold that a state court’s factfinding process is materially
    defective if we are ‘satisfied that any appellate court to
    whom the defect is pointed out would be unreasonable in
    holding that the state court’s fact-finding process was
    adequate.’” 
    Id.
     (quoting Taylor, 
    366 F.3d at 1000
    ). Cook
    fails to overcome this standard because he does not show
    how the state court was required to afford him an evidentiary
    hearing to develop a factual allegation of which he was
    aware, but did not raise, at trial. In short, Cook is not entitled
    COOK V. KERNAN                       35
    to an evidentiary hearing under AEDPA, and the district
    court did abuse its discretion in denying his request.
    IV.
    We affirm the district court’s denial of relief on Cook’s
    claim that his confession was obtained in violation of his
    constitutional rights. Based on the record, the state habeas
    court had a reasonable basis for finding that Cook’s waiver
    was knowing and intelligent, and that his confession was not
    coerced and involuntary. In addition, Cook is not entitled to
    an evidentiary hearing on the issue of the voluntariness of
    his confession because he failed to timely develop in state
    court the factual basis for his claim that Sergeant Eatmon
    threatened him at gunpoint. The district court’s denial of
    Cook’s habeas petition is AFFIRMED.
    CALLAHAN, Circuit Judge, concurring:
    Because the state court could have reasonably denied
    Cook’s claim on the ground that his Miranda waiver was
    valid and his statements to police were voluntarily given, we
    are compelled to deny relief under AEDPA and need not
    reach the question of whether Cook was prejudiced by the
    admission of his statements. But if we did, I would agree
    with the district court that the California Supreme Court
    could have reasonably denied Cook’s claim on the ground
    that any error was harmless.
    “For reasons of finality, comity, and federalism, habeas
    petitioners ‘are not entitled to habeas relief based on trial
    error unless they can establish that it resulted in actual
    prejudice.’” Davis v. Ayala, 
    135 S. Ct. 2187
    , 2197, 
    192 L. Ed. 2d 323
     (2015) (quoting Brecht v. Abrahamson, 
    507 U.S. 36
                       COOK V. KERNAN
    619, 637 (1993)). In testing for prejudice under AEDPA’s
    deferential standard of review, “relief is proper only if” we
    have “grave doubt about whether a trial error of federal law
    had ‘substantial and injurious effect or influence in
    determining the jury’s verdict.’” 
    Id.
     at 2197–98 (quoting
    O'Neal v. McAninch, 
    513 U.S. 432
    , 436 (1995)). This
    standard “reflects the view that a ‘State is not to be put to
    th[e] arduous task [of retrying a defendant] based on mere
    speculation that the defendant was prejudiced by trial error;
    the court must find that the defendant was actually
    prejudiced by the error.’” Id. at 2198 (quoting Calderon v.
    Coleman, 
    525 U.S. 141
    , 146 (1998) (per curiam)). Thus, to
    warrant relief under AEDPA, Cook must show that he was
    actually prejudiced by the admission of his statements at
    trial—“a standard that he necessarily cannot satisfy if a
    fairminded jurist could agree with the California Supreme
    Court’s decision that [the error was harmless].” Id. at 2199.
    Given the totality of the record evidence, Cook is unable
    to establish that his statements regarding the murders of
    Bettencourt and Morris, if erroneously admitted, had
    “substantial and injurious effect” on the jury’s findings of
    guilt as to those murders. Brecht, 
    507 U.S. at 637
    . As the
    dissent points out, a “defendant’s own confession is
    probably the most probative and damaging evidence that can
    be admitted against him.” Arizona v. Fulminante, 
    499 U.S. 279
    , 296 (1991) (citing Bruton v. United States, 
    391 U.S. 123
    , 139–40 (1968) (White, J., dissenting)). In Cook’s case
    however, the equivocal statements he made in confessing to
    the Bettencourt and Morris murders are not particularly
    damning admissions of guilt. Even after seven hours of
    questioning, Cook provided little detail as to why or how he
    committed the murders, offering only vague accounts that he
    was at each of the crime scenes with a weapon in hand and
    “blanked out.” If anything, Cook’s admissions in his taped
    COOK V. KERNAN                               37
    interview provided evidence that mitigated his mental
    culpability for the crimes, which his defense team
    reasonably viewed as helpful to his case.
    Moreover, both the Bettencourt and Morris murders
    were supported by several different sources of evidence—
    including the corroborating testimonies of multiple
    witnesses and forensic evidence—all of which consistently
    demonstrated that Cook’s shootings of these victims
    amounted to similar instances of unprovoked, cold-blooded
    murder. The Bettencourt murder was witnessed by a large
    group of individuals at the scene, and seven witnesses gave
    statements to police that identified Cook as the shooter.
    Likewise, the Morris murder was witnessed by the two other
    inhabitants in Cook’s car, as well as the women in the car
    behind them.
    The dissent claims that most of this evidence was “either
    seriously compromised or inconclusive” based on witness
    recantations at trial, bias and motives to fabricate, and some
    inconsistencies in the evidence. 1 However, even without the
    1
    The dissent also argues that the admission of Cook’s confession
    was prejudicial because it led to the trial court’s improper joinder of his
    three murder charges, even though Cook himself does not raise this
    argument in his habeas petition. In reviewing a state court’s summary
    denial of a habeas claim under AEDPA, our task is to determine “what
    arguments or theories . . . could have supported[] the state court’s
    decision,” Harrington v. Richter, 
    562 U.S. 86
    , 102 (2011), not to search
    for any arguments or theories that could have supported an opposite
    conclusion and grant of relief. Even if we were to consider the question
    of prejudice through the lens of an improper joinder claim, the California
    Supreme Court reasonably found on direct appeal that the trial court’s
    joinder of the charges was proper, and did so by relying on evidence that
    was independent of Cook’s confession—i.e., the “substantial cross-
    admissibility” of the ballistics evidence between the Bettencourt and
    38                     COOK V. KERNAN
    eyewitness accounts that were allegedly “compromised” by
    bias or recantation, the record contains evidence from
    unbiased sources sufficient to support the jury’s verdicts for
    the two murders. For instance, in regard to the Morris
    murder, Sharoon Reed—a neutral bystander eyewitness with
    no apparent bias or motive to fabricate—provided an
    account that corroborated the testimony of Senegal and
    Branner. Similarly, Nathan Gardner, a bystander who
    happened to be on Alberni Street when he saw Cook shoot
    Bettencourt, gave Cook a ride from the murder scene and
    testified that Cook explained that he shot Bettencourt
    because Bettencourt had tried to “gaffle” him. Perhaps more
    importantly, Cook’s various challenges to the witnesses’
    credibility and other evidence were fully presented to and
    weighed by the jury at trial. Ultimately, they do not
    undermine the highly probative facts that multiple
    witnesses—from different vantage points at each of the
    crime scenes and with different relationships to Cook—
    provided generally consistent accounts, which, along with
    the ballistics evidence, clearly implicated Cook.
    In light of the weight of the evidence in the record, the
    state habeas court could have reasonably denied Cook’s
    claim on the basis that the admission of his confession did
    not prejudice him at trial. Because Cook is unable to show
    actual prejudice or that no fairminded jurist could agree with
    the California Supreme Court’s rejection of his claim on the
    basis of harmlessness, he is not entitled to relief under
    AEDPA.
    Morris murders, and the common eyewitness between the Morris and
    Sadler murders. See People v. Cook, 
    139 P.3d 492
    , 505 (Cal. 2006).
    COOK V. KERNAN                          39
    MURGUIA, Circuit Judge, dissenting:
    I respectfully disagree with the majority’s conclusion
    that the California Supreme Court could have reasonably
    denied habeas relief on the basis that Cook (1) knowingly
    and intelligently waived his Miranda rights; and (2) suffered
    no prejudice from the improper admission of his unlawfully
    obtained confession to the Bettencourt murder and other
    incriminating statements. Accordingly, I would reverse the
    district court’s denial of habeas relief.
    1. Standard of Review.
    Under the Antiterrorism and Effective Death Penalty Act
    (“AEDPA”), a writ of habeas corpus may not be granted
    unless the state court’s decision (1) resulted in a decision that
    was contrary to, or involved an unreasonable application of,
    clearly established federal law, as determined by the
    Supreme Court of the United States, 
    28 U.S.C. § 2254
    (d)(1);
    or (2) resulted in a decision that was based on an
    unreasonable determination of the facts in light of the
    evidence presented in the state court proceeding, 
    id.
    § 2254(d)(2).
    “The state court unreasonably applies clearly established
    federal law if it ‘either 1) correctly identifies the governing
    rule but then applies it to a new set of facts in a way that is
    objectively unreasonable, or 2) extends or fails to extend a
    clearly established legal principle to a new context in a way
    that is objectively unreasonable.’” DeWeaver v. Runnels,
    
    556 F.3d 995
    , 997 (9th Cir. 2009) (quoting Hernandez v.
    Small, 
    282 F.3d 1132
    , 1142 (9th Cir. 2002), and then citing
    Williams v. Taylor, 
    529 U.S. 362
    , 408–09 (2000)); see also
    Mann v. Ryan, 
    828 F.3d 1143
    , 1151 (9th Cir. 2016) (en
    banc). “As a condition for obtaining habeas corpus from a
    federal court, a state prisoner must show that the state court’s
    40                   COOK V. KERNAN
    ruling on the claim being presented in federal court was so
    lacking in justification that there was an error well
    understood and comprehended in existing law beyond any
    possibility of fairminded disagreement.” Harrington v.
    Richter, 
    562 U.S. 86
    , 103 (2011); see also Metrish v.
    Lancaster, 
    569 U.S. 351
    , 358 (2013).
    “Factual determinations by state courts are presumed
    correct absent clear and convincing evidence to the contrary,
    § 2254(e)(1), and a decision adjudicated on the merits in a
    state court and based on a factual determination will not be
    overturned on factual grounds unless objectively
    unreasonable in light of the evidence presented in the state-
    court proceeding, § 2254(d)(2).” Miller-El v. Cockrell,
    
    537 U.S. 322
    , 340 (2003); Davis v. Ayala, 
    135 S. Ct. 2187
    ,
    2199–2200 (2015) (“State-court factual findings, . . . are
    presumed correct; the petitioner has the burden of rebutting
    the presumption by clear and convincing evidence.” (quoting
    Rice v. Collins, 
    546 U.S. 333
    , 338–39 (2006))). “Even in the
    context of federal habeas, …[d]eference does not by
    definition preclude relief. A federal court can disagree with
    a state court’s credibility determination and, when guided by
    the AEDPA, conclude the decision was unreasonable or that
    the factual premise was incorrect by clear and convincing
    evidence.” Miller-El v. Cockrell, 
    537 U.S. at 340
    .
    Here, the California Supreme Court “denied on the
    merits” all of Cook’s habeas claims—including that he did
    not knowingly and intelligently waive his Miranda rights—
    in a summary order, unaccompanied by an opinion
    explaining the reasons relief was denied. “Section 2254(d)
    applies even where there has been a summary denial.”
    Cullen v. Pinholster, 
    563 U.S. 170
    , 187 (2011) (citing
    Richter, 
    562 U.S. at 98
    ). “Where a state court’s decision is
    unaccompanied by an explanation, the habeas petitioner’s
    COOK V. KERNAN                         41
    burden still must be met by showing there was no reasonable
    basis for the state court to deny relief.” Richter, 
    562 U.S. at 98
    . Therefore, when the state court summarily denies a
    petitioner habeas relief, “[u]nder § 2254(d), a habeas court
    must determine what arguments or theories . . . could have
    supported the state court’s decision; and then it must ask
    whether it is possible fairminded jurists could disagree that
    those arguments or theories are inconsistent with the holding
    in a prior decision of [the Supreme] Court.” Id. at 102
    (emphasis added); see also Wilson v. Sellers, 
    138 S. Ct. 1188
    , 1191–92 (2018) (“Deciding whether a state court’s
    decision ‘involved’ an unreasonable application of federal
    law or ‘was based on’ an unreasonable determination of fact
    requires the federal habeas court to ‘train its attention on the
    particular reasons—both legal and factual—why state courts
    rejected a state prisoner’s federal claims,’ and to give
    appropriate deference to that decision” (quoting Hittson v.
    Chatman, 
    135 S.Ct. 2126
    , 2126 (2015) (Ginsburg, J.,
    concurring in denial of certiorari) and then citing Richter,
    
    562 U.S. at
    101–102)); Johnson v. Williams, 
    568 U.S. 289
    ,
    293 (2013) (holding that where a state habeas court issues an
    opinion that addresses some issues but does not expressly
    address the federal habeas claim in question, that claim
    “must be presumed to have been adjudicated on the merits
    by the [state habeas court] . . . [and] the restrictive standard
    of review set out in § 2254(d)(2) applies”).
    If we conclude that the state habeas court committed a
    constitutional error during a criminal trial, we “must [then]
    assess the prejudicial impact of the error under the
    ‘substantial and injurious effect’ standard set forth in Brecht
    v. Abrahamson.” Fry v. Pliler, 
    551 U.S. 112
    , 114 (2007)
    (quoting 
    507 U.S. 619
     (1993)); see also Jones v. Harrington,
    
    829 F.3d 1128
    , 1141 (9th Cir. 2016) (“In AEDPA
    proceedings, [the court] appl[ies] the actual-prejudice
    42                    COOK V. KERNAN
    standard set forth [Brecht].”). “There must be more than a
    ‘reasonable possibility’ that the error was harmful.” Ayala,
    
    135 S. Ct. at 2198
     (quoting Brecht, 
    507 U.S. at 637
    ). “[A]
    ‘State is not to be put to th[e] arduous task [of retrying a
    defendant] based on mere speculation that the defendant was
    prejudiced by trial error; the court must find that the
    defendant was actually prejudiced by the error.’” 
    Id.
    (quoting Calderon v. Coleman, 
    525 U.S. 141
    , 146 (1998)
    (per curiam)).
    2. The state habeas court’s summary conclusion
    that Cook knowingly and intelligently waived his
    Miranda rights was an unreasonable application
    of Thompkins and its progeny and relied on an
    unreasonable determination of the facts.
    The state habeas court’s summary order finding that
    Cook knowingly and intelligently waived his Miranda rights
    is an unreasonable application of Berghuis v. Thompkins,
    
    560 U.S. 370
    , 384 (2010), which is clearly established
    federal law, and relies on an unreasonable determination of
    the facts. Therefore, the admission of Cook’s confession to
    the Bettencourt murder and other incriminating statements
    about the Morris murder constitutes an unconstitutional trial
    error under AEDPA.
    I would affirm the district court’s well-supported finding
    that Cook’s Miranda waiver was not knowing and intelligent
    under Thompkins, “[g]iven substantial evidence of his
    inability to comprehend his rights, including his youth, low
    IQ, psychological deficiencies, inability to follow verbal
    instructions, dissociation, and his statements to interrogators
    that he did not understand he had the right to have a lawyer
    present at his interrogation[.]”
    COOK V. KERNAN                        43
    The Supreme Court has clearly established that a
    Miranda waiver must be done knowingly and intelligently.
    Thompkins, 
    560 U.S. at 383
     (quoting Miranda v. Arizona,
    
    384 U.S. 436
    , 475 (1966)). There is a well-established
    presumption against waiver, North Carolina v. Butler,
    
    441 U.S. 369
    , 373 (1979) (quoting Miranda, 
    384 U.S. 436
    ,
    475 (1966)), and the government bears the burden of
    overcoming that presumption by introducing sufficient
    evidence that, under the totality of the circumstances, Cook
    was aware of “the nature of the right being abandoned and
    the consequences of the decision to abandon it.” Moran v.
    Burbine, 
    475 U.S. 412
    , 421 (1986); see also Thompkins,
    
    560 U.S. at 384
     (clarifying “that this ‘heavy burden’ is . . .
    the burden to establish waiver by a preponderance of the
    evidence” (citing Colorado v. Connelly, 
    479 U.S. 157
    , 168
    (1986))). The government’s burden to make such a showing
    “is great,” and we “must indulge every reasonable
    presumption against waiver of fundamental constitutional
    rights.” United States v. Heldt, 
    745 F.2d 1275
    , 1277 (9th
    Cir.1984) (citing Johnson v. Zerbst, 
    304 U.S. 458
    , 464
    (1938)).
    There is no objectively reasonable basis for the
    California Supreme Court’s holding that Cook, an
    intellectually disabled man with severe mental illnesses, was
    competent to fully understand and waive his Miranda rights.
    Although the Supreme Court has never directly addressed
    whether intellectually disabled and mentally ill defendants
    can knowingly and intelligently waive their Fifth
    Amendment rights, it would be unreasonable not to apply the
    principles of Thompkins and its progeny to award habeas
    relief in this case. See Williams, 
    529 U.S. at 407
     (holding
    that a state-court decision can be overturned by the federal
    courts if the state “unreasonably refuses to extend [a]
    principle to a new context where it should apply”); cf.
    44                    COOK V. KERNAN
    Bradley v. Duncan, 
    315 F.3d 1091
    , 1100–01 (9th Cir. 2002)
    (holding that state court’s refusal to allow petitioner to put
    on entrapment defense constituted unreasonable application
    of federal law as it violated his “right to present a complete
    and meaningful defense to the jury under the principles set
    out in [Supreme Court cases]”).
    The majority advances what are the only four possible
    reasons that could have supported the California Supreme
    Court’s decision to summarily deny Cook’s claim that he did
    not knowingly and intelligently waive his Miranda rights.
    First, my colleagues state that Cook fully understood he was
    waiving his Miranda rights because, at the outset of the
    June 26, 1992 interrogation, he “readily affirmed that he
    understood his rights and wanted to speak anyway.” Op.
    at 25. Second, they reason that “throughout much of the
    [June 26 interrogation], Cook was able to respond
    coherently to the investigator’s questions.” Op. at 26. Third,
    they submit that he “changed his mind the next day,
    proffering the self-serving excuse that he had not earlier
    understood his right to counsel.” Op. at 26–27. Finally, the
    majority relies significantly on the fact that Cook had been
    arrested and presumably read his Miranda rights in the past.
    Op. at 26. None of these reasons “could have led a
    fairminded jurist to conclude that” Cook knowingly and
    intelligently waived his constitutional rights pursuant to
    Thompkins and its progeny. Sexton v. Beaudreaux, 
    138 S. Ct. 2555
    , 2559 (2018) (citing Richter, 
    562 U.S. at 102
    ).
    In turn, I will address each of the majority’s misguided
    reasons for denying habeas relief.
    First, I disagree with the majority’s unsupported holding
    that one-word verbal affirmations are sufficient, considering
    the totality of other circumstances involved here, to establish
    that a man with Cook’s acute intellectual disability and
    COOK V. KERNAN                              45
    mental illnesses had a “full awareness of both the nature of
    the right being abandoned and the consequences of the
    decision to abandon it.” Thompkins, 
    560 U.S. at
    382–83
    (quoting Burbine, 
    475 U.S. at 421
    ).
    It is undisputed that Cook verbally responded “yeah” and
    “uh-hum” when asked if he understood his Miranda rights
    at the outset of the June 26 seven-hour interrogation, during
    which he confessed to the Bettencourt murder and made
    other incriminating statements about the Morris murder. At
    best, this “establishes that a Miranda warning was given and
    the accused made an uncoerced statement,” which “standing
    alone, is insufficient to demonstrate ‘a valid waiver’ of
    Miranda rights.” Thompkins, 
    560 U.S. at 384
     (quoting
    Miranda, 
    384 U.S. at 475
    ). “The prosecution must make the
    additional showing that the accused understood these
    rights.” 
    Id.
     (citations omitted). Here, there is overwhelming
    evidence that Cook did not understand his rights due to his
    serious intellectual disability and mental illnesses. In fact,
    at the direction of the California Supreme Court, the trial
    court found that Cook was intellectually disabled within the
    meaning of Atkins v. Virginia, 
    536 U.S. 304
     (2002), vacating
    his death penalty and imposing a sentence of life without the
    possibility of parole. 1 Although not determinative, the state
    trial court’s finding that Cook was intellectually disabled
    under Atkins creates a strong presumption that Cook was
    unable to understand his Miranda rights, and thus unable to
    knowingly and intelligently waive them. See United States
    1
    The Supreme Court explicitly reasoned in Atkins that intellectually
    disabled defendants are ineligible for the death penalty, in large part,
    because they are very susceptible to offering false confessions. See
    
    536 U.S. at
    320 (citing Everington & Fulero, Competence to Confess:
    Measuring Understanding and Suggestibility of Defendants with Mental
    Retardation, 37 Mental Retardation 212, 212–213, 535 (1999)).
    46                   COOK V. KERNAN
    v. Garibay, 
    143 F.3d 534
    , 538 (9th Cir. 1998) (holding that
    defendant could not have knowingly and intelligently
    waived his Miranda rights because his “IQ is borderline
    retarded” and he was unable “to understand oral
    instructions”).
    In order to reach the opposite outcome, the state habeas
    court and the majority completely—and erroneously—
    overlook the uncontroverted expert testimony of Dr. Woods
    and Dr. Wilkinson that Cook is “dependent upon cues and
    guidance from others to maintain a useful and functional
    organization of information”, “readily incorporates cues,
    prompting and direction from others,” and is vulnerable to
    “suggestibility and confabulation.” This uncontradicted
    expert testimony conclusively establishes that Cook was
    unable to understand his constitutional rights, even if he
    made statements to the contrary.
    The state trial court’s determination that Cook is
    intellectually disabled was also supported by an
    overwhelming wealth of expert testimony that expanded on
    the depth and severity of Cook’s intellectual disability.
    Before trial, Doctor William Lynch, a neuropsychologist,
    testified that Cook’s “verbal and performance abilities fall[]
    at the extreme low-end of the Average range,” that he suffers
    from a developmental learning disability involving reading
    and writing, and that he had a “narrow, precarious attention
    span that can be interrupted easily.” As a result, Cook “often
    fails to apprehend complete messages (words, phrases or
    numbers)” and “is apt to have difficulty with understanding
    complex spoken and written speech.” Doctor Myla Young,
    a clinical psychologist, also testified that Cook’s mental
    function was “Borderline to Low Average” and that, even
    though his general IQ was a very low 83, his performance on
    the part of the test that measures his ability to process new
    COOK V. KERNAN                        47
    information resulted in a below-average IQ of 78.
    Accordingly, Dr. Young concluded that Cook had a
    cognitive “level of performance . . . similar to that
    demonstrated by most children with an age equivalence of
    9.9 years old.” Similarly, Dr. George Wilkinson, who
    evaluated Cook, concluded that Cook “had life-long
    attentional and learning disabilities that reduced his
    performance even below his measured intelligence level of
    borderline to below average.” In other words, all these
    experts agreed that Cook is intellectually disabled to such a
    degree that it was impossible for him to understand his
    constitutional rights, let alone waive them.
    Mental health experts who evaluated Cook also testified
    that, in addition to his low IQ, Cook suffers from grave
    mental illnesses that prevented him from understanding the
    rights he was giving up. Doctor George Woods, a
    psychiatrist, diagnosed Cook with an organic brain disorder
    that causes him to dissociate and to fail to recall information
    and details. He also diagnosed Cook with post-traumatic
    stress disorder (“PTSD”) and depression. According to
    Dr. Woods, Cook “readily incorporates cues, prompting and
    direction from others” and is vulnerable to “suggestibility
    and confabulation.” Therefore, Dr. Woods concluded that
    Cook satisfies the diagnostic criteria for “mental retardation”
    if you couple these mental illnesses with his borderline
    intellectual functioning. Given Cook’s cognitive and mental
    disabilities, Doctor Zakee Matthews, a clinical psychiatrist
    who reviewed the video recording of Cook’s interrogation,
    also opined that “it was extremely unlikely Mr. Cook could
    have meaningfully understood the admonition regarding his
    legal rights as expressed in the language and manner used by
    the interrogating officers.”
    48                    COOK V. KERNAN
    The government never offered expert testimony to
    contradict the opinions of the mental health experts who
    unanimously testified that Cook’s intellectual disabilities
    and severe mental illnesses prevented him from
    understanding the rights he was giving up. See Garibay,
    
    143 F.3d at 538
     (finding no valid Miranda waiver because
    “[t]he government presented no evidence to contradict the
    fact that [the defendant] . . . is borderline retarded with
    extremely low verbal-English comprehension skills”).
    Therefore, there is no expert evidence in the record to
    support the state habeas court’s summary denial or the
    majority’s holding, which rely on the disproven assumption
    that Cook was intellectually competent to knowingly and
    intelligently waive his rights. See United States v. Glover,
    
    596 F.2d 857
    , 865 (9th Cir. 1979) (upholding Miranda
    waiver because the court properly relied on the prosecution’s
    expert’s testimony “that [the defendant] was competent to
    waive his rights if they were explained to him in simple
    language”).
    In light of Cook’s significant intellectual disabilities and
    mental illnesses, the majority’s contention that Cook’s one-
    word affirmations at the outset of the June 26 interrogation
    were enough for the California Supreme Court to deny
    habeas relief defies common sense and federal law clearly
    established by the Supreme Court in Thompkins and its
    progeny. Rather, any fairminded jurist faithfully applying
    those controlling precedents in this case would conclude that
    Cook was so intellectually disabled and mentally ill that he
    was unable to knowingly and intelligently waive his
    constitutional rights.
    Second, the majority’s contention that Cook provided
    coherent answers to the investigators’ questions during the
    June 26, 1992 interrogation is an unreasonable
    COOK V. KERNAN                               49
    determination of the facts. To the contrary, the transcript and
    videotape of the interrogation show that Cook is obviously
    confused and distressed, and his responses are unfocused
    and hard to follow. At the outset of the interrogation, for
    example, Cook stated that his birthday was September 25,
    1971 (which would have made him twenty years old) and
    that he was nineteen years old. When Inspector Sabin
    explained the contradiction between his answers, Cook
    responded with “. . . that’s what, what my mother told me,
    so.” But, Cook stated, he “knew for a fact” he was going to
    be “twenty this year.” He was wrong about his birthday and
    his age. Cook also did not know addresses of where he had
    lived for the past five or six months; gave multiple
    contradictory statements about dates and durations; did not
    know the day of the week or what month it was; and failed
    to remember how he got to Oklahoma. All this occurred
    within the first couple of minutes of the June 26
    interrogation.    The district court therefore correctly
    interpreted this colloquy—the first set of questions after
    Cook was Mirandized—as one of the first “signs that Cook
    was either seriously confused, or otherwise mentally
    incompetent.”
    Later in the interrogation, at round 9:34 p.m., in response
    to lengthy and suggestive questions by Inspector Sabin about
    what Morris said or did to trigger the shooting, Cook began
    to cry, stating, “No, I never do nothing to nobody, I try to be
    everybody friend. I can’t work ‘cause I live on another part
    [of town].” As Inspector Sabin persisted with questions
    about the Morris shooting, Cook continued to cry
    uncontrollably and to reiterate incessantly that he was afraid
    to endanger his family. 2 It is in this highly rambling and
    2
    Cook made increasingly paranoid statements about his family
    being in danger: “I’m in for it regardless if I say something or not, if I,
    50                         COOK V. KERNAN
    distressed mental state that Cook made the incriminating
    admissions that he was in the car with Branner and Senegal
    the night of the Morris murder, had a gun with him, and
    “blanked out” after Morris approached the vehicle. No
    reasonable jurist could read this transcript or view this
    videotape and conclude that Cook was responding
    “coherently.”
    Cook’s distress and confusion got worse. At around
    11:13 p.m., Cook was sobbing loudly when he disclosed that
    his father used to beat his mother in response to Inspector
    Sabin’s question about why he went to see a therapist when
    he was younger. From this point, Cook became increasingly
    emotional and incoherent. Sabin and Eatmon offered him a
    drink, which he declined, and unsuccessfully tried to loop
    back to questioning about Morris. While still crying
    uncontrollably, Cook continued to talk about his abusive
    childhood while making distressed and nonsensical
    statements, such as: “I don’t care, they can kill me, do
    whatever they want, I don’t care no more,”; “I hope they kill
    me or whatever, I don’t want to worry about waking up every
    night, just thinking about got to help my mother, and I can’t
    do nothing to stop it . . . let them kill me, I don’t care, I have
    nothing to live for, nobody even care about me anyway so, I
    mean, it’s better if I’m gone”; and “I don’t care what happens
    to me, kill me, I’d be more of a big heavy burden.” At
    if I tell you something, then put my family life in danger, I’d rather
    something just happen to me;” “It shouldn’t really matter, whatever I say
    now, you said I’m guilty, you got, you got all this stuff that I’m in it, so
    . . . regardless of what I say, you know what I’m saying, it’s not going to
    happen, you know what I’m saying, if you all plan on killing me or
    whatever . . . well, I’m doing electric chair or 25 to life . . . it’s, it just
    don’t matter now;” “And then, after I tell you all the truth, whatever it is,
    who, you know what I’m saying, I got to face the consequences of what
    happened to, what if somebody kill my father and them.”
    COOK V. KERNAN                         51
    around 11:38 p.m., the investigators decided to take a break
    for Cook to calm down and escorted Cook back to his cell.
    When the taped interview resumed at around 12:10 a.m.,
    Inspector Sabin reminded Cook of his Miranda rights and
    then began questioning him about the Bettencourt murder.
    But the break did not work, because Cook quickly became
    very distressed, confused, and incoherent. This is when
    Cook abruptly confessed to the Bettencourt murder. Cook’s
    distress and confusion during the lengthy interrogation
    escalated to the point that by the end he was violently
    coughing and vomiting.
    The mental health experts who evaluated Cook
    confirmed that Cook was confused, distressed, and
    incoherent during the June 26 interrogation. Coupled with
    Cook’s intellectual disability and mental illnesses, these
    experts unanimously concluded that it was impossible for
    him to understand his Miranda rights, let alone to knowingly
    and intelligently waive them. “[B]ased on signs of
    Mr. Cook’s impaired cognition, distractibility[,] and
    dissociative tendencies during clinical assessments, and
    similar signs appearing in the videotape,” Dr. Matthews
    testified that “it is evident that [Cook’s] limited abilities to
    attend to or comprehend minimally complex language were
    overwhelmed during the commencement of the interview.”
    Dr. Wilkinson agreed that “the circumstances of the
    interrogation, including Mr. Cook’s neuropsychological and
    intellectual impairments and the effects of his trauma-based
    symptoms, prevented him from knowingly and intelligently
    understanding and waiving his right to remain silent.”
    Therefore, the majority’s contention that Cook was
    “coherent” throughout most of the June 26 interrogation is
    simply unfounded. Such an unreasonable determination of
    the facts in the record could not justify the California
    52                   COOK V. KERNAN
    Supreme Court’s denial of relief here. Rather, a fairminded
    jurist reviewing the transcript and videotape of the
    interrogation—and the expert evaluation of those
    materials—would find that Cook was distressed, confused,
    and incoherent throughout most of the interview, especially
    when he confessed to the Bettencourt murder and made other
    incriminating statements about the Morris murder.
    Third, the majority argues that the California Supreme
    Court could have reasonably found that Cook conveniently
    pretended that he did not understand his rights the day after
    the June 26 interrogation as “a self-serving excuse” to
    backtrack his prior waiver. Op. at 26–27. This conclusion
    is also an unreasonable determination of the facts under
    AEDPA.
    The day after his June 26 interrogation—during which
    he confessed and made other incriminating statements—
    Cook explicitly stated that he did not understand his
    Miranda rights, including the right to have an attorney
    present during questioning. When the investigators again
    read his rights before the second interview, Cook asked,
    “when you all talk to me, I’m supposed to have an attorney
    here or something?” The officers clarified that he had the
    right to have an attorney present. This led to the following
    exchange:
    Cook: Is that the only time you could have an
    attorney to be able, when you go to court?
    Inspector Sabin: You can have an attorney
    present any time during these [] proceedings.
    Cook: I didn’t know that.
    COOK V. KERNAN                        53
    Inspector Sabin: Okay, well, do you
    remember me reading that off to you
    yesterday?
    Cook: Not really, but I remember you was
    reading something about my rights.
    At this juncture, Cook asked to speak with his mother and
    refused to continue talking until he had done so. Inspector
    Sabin then asked him a series of questions trying to surmise
    what Cook had understood to be his Miranda rights when he
    appeared to waive them the day before. Cook reiterated that
    he “didn’t know that . . . when you guys talked to me that I
    could have a lawyer here.” Cook then proceeded to meet
    privately with his mother, after which he refused to continue
    speaking to the investigators until he had a chance to talk to
    a lawyer.
    The only objectively reasonable interpretation of this
    exchange—given his intellectual disability and mental
    illnesses—is that Cook did not understand his Miranda
    rights until he had a chance to talk to his mother, well after
    he confessed to the Bettencourt murder and made other
    incriminating statements the night before. The majority’s
    skepticism of Cook’s motives in asking these questions is
    unreasonable, especially considering the undisputed
    evidence that he was intellectually disabled and suffered
    from grave mental illnesses. If anything, no fairminded
    jurist would disagree that these questions are further
    evidence that Cook did not truly understand his
    constitutional rights the night before.
    Finally, the majority proclaims that Cook understood his
    Miranda rights because he “[he] has been arrested and
    provided Miranda waivers on several occasions in the past.”
    54                    COOK V. KERNAN
    Op. at 26. But the record clearly supports a finding that
    Cook did not understand his Miranda rights at the time of
    his previous arrests, either. As an initial matter, those arrests
    occurred when he was a minor. More importantly, when
    Inspector Sabin asked him if he had read and understood his
    Miranda rights when he was arrested in the past, Cook
    explained that “[he] didn’t know . . . when [] people come to
    question you, you can have a lawyer present with you.”
    Therefore, these past experiences “do not indicate that
    [Cook] was familiar with his Miranda rights and his option
    to waive those rights” based on his prior experiences with
    law enforcement. Garibay, 
    143 F.3d at
    539 (citing Cooper
    v. Griffin, 
    455 F.3d 1142
    . 1144–45 (5th Cir. 1972)). The
    majority’s contention otherwise is an unreasonable
    determination of the facts and thus cannot justify the
    California Supreme Court’s denial of habeas relief.
    In sum, under AEDPA, it was both “an unreasonable
    application of clearly established federal law, as determined
    by the Supreme Court of the United States” in Thompkins
    and its progeny, and “an unreasonable determination of the
    facts,” for the state habeas court to summarily conclude that
    Cook’s Miranda waiver was knowing and intelligent despite
    the overwhelming evidence to the contrary. 
    28 U.S.C. §§ 2254
    (d)(1), (d)(2). Indeed, “there was no reasonable
    basis for the state court to deny relief,” or for the majority to
    conclude—contrary to uncontroverted expert testimony—
    that a defendant who is intellectually disabled and suffers
    from serious mental illnesses, is interrogated for seven
    hours, and shows visible physical signs of extreme distress
    and confusion, knowingly and intelligently waived his
    COOK V. KERNAN                              55
    Miranda rights. Richter, 
    562 U.S. at 98
    . No reasonable
    fairminded jurist would conclude otherwise. 3 
    Id. at 103
    .
    3. The admission of Cook’s unlawfully obtained
    confession and other incriminating statements
    was harmful.
    The conclusion that no reasonable jurist would have
    found Cook’s Miranda waiver valid does not end our
    inquiry. Cook is “not entitled to habeas relief based on trial
    error unless [he] can establish that it resulted in actual
    prejudice.” Ayala, 
    135 S. Ct. at 2197
     (2015) (quoting
    Brecht, 
    507 U.S. at 637
    ). The California Supreme Court’s
    summary order denying habeas relief also failed to explicitly
    address whether Cook was prejudiced by the improper
    admission of his unlawfully obtained confession to the
    Bettencourt murder and other incriminating statements
    about the Morris murder. Nonetheless, “relief is proper only
    if the federal court has ‘grave doubt about whether a trial
    error of federal law had substantial and injurious effect or
    influence in determining the jury’s verdict.’” 
    Id.
     at 2197–98
    (quoting O’Neal v. McAninch, 
    513 U.S. 432
    , 436 (1995)).
    A “defendant’s own confession is probably the most
    probative and damaging evidence that can be admitted
    against him.” Fulminante, 
    499 U.S. 279
    , 296 (1991) (citing
    Bruton v. United States, 
    391 U.S. 123
    , 139–40 (1968)
    (White, J., dissenting)). “Certainly, confessions have
    profound impact on the jury, so much so that we may
    justifiably doubt its ability to put them out of mind even if
    told to do so.” 
    Id.
     Therefore, in order to deny Cook’s claim
    3
    Because Cook’s Miranda waiver was not done knowingly and
    intelligently, we do not need to reach the issue of whether his confession
    was involuntary or coerced.
    56                   COOK V. KERNAN
    on the basis that there was no prejudice, the California
    Supreme Court “must be able to declare” that the admission
    of Cook’s confession and other incriminating statements
    “was harmless beyond a reasonable doubt.” 
    Id.
     at 295 (citing
    Chapman v. California, 
    386 U.S. 18
    , 24 (1967)). In other
    words, “[t]he prejudice from [a defendant’s] confession
    cannot be soft pedaled.” Anderson v. Terhune, 
    16 F.3d 781
    ,
    792 (9th Cir. 2008) (en banc).
    Here, the unconstitutional admission of Cook’s
    confession to the Bettencourt murder and other
    incriminating statements at trial was harmful in two distinct
    ways: (1) the trial court relied on these admissions to
    impermissibly hold a single joint trial for the unrelated
    murders of Sadler, Bettencourt, and Morris, in violation of
    Cook’s due process rights; and (2) the confession was central
    to his conviction because the other evidence against him was
    inconsistent and highly compromised. Therefore, I “think
    that the [admission of Cook’s unlawfully obtained
    confession to the Bettencourt murder and other
    incriminating statements about the Morris murder]
    substantially influenced the jury’s decision” and I have no
    doubt that it had an injurious effect on the jury’s verdict.
    O’Neal, 
    513 U.S. at 436
    ; see also Poyson v. Ryan, 
    879 F.3d 875
    , 891–92 (9th Cir.) (as amended), cert. denied, 
    138 S. Ct. 2652
     (2018).
    a. The admission of Cook’s confession and other
    incriminating statements resulted in the
    harmful consolidation of the three unrelated
    murders into a single trial.
    The unconstitutional admission of Cook’s unlawfully
    obtained confession to the Bettencourt murder and other
    incriminating statements led the trial court to impermissibly
    consolidate the three unrelated murders of Bettencourt,
    COOK V. KERNAN                        57
    Morris, and Sadler into a single trial, which “resulted in
    prejudice so great as to deny [Cook] of his Fifth Amendment
    right to a fair trial.” United States v. Lane, 
    474 U.S. 438
    , n.
    8 (1986); see also Bean v. Calderon, 
    163 F.3d 1073
    , 1084
    (9th Cir. 1998) (“The simultaneous trial of more than one
    offense must actually render petitioner’s state trial
    fundamentally unfair and hence, violative of due process
    before relief pursuant to 
    28 U.S.C. § 2254
     would be
    appropriate” (quoting Featherstone v. Estelle, 
    948 F.2d 1497
    , 1503 (9th Cir. 1991)); Davis v. Woodford, 
    384 F.3d 628
    , 638 (9th Cir. 2004) (modifications in original) (holding
    that there is a prejudicial constitutional violation where the
    “simultaneous trial of more than one offense . . . actually
    render[ed] petitioner’s state trial fundamentally unfair and
    hence, violative of due process.” (quoting Sandoval v.
    Calderon, 
    241 F.3d 765
    , 771–72 (9th Cir. 2001)).
    Cook’s joint trial for the three unrelated murders of
    Bettencourt, Morris, and Sadler was highly prejudicial
    because it allowed evidence admissible as to only one of the
    murder charges to impermissibly “spillover” to the other
    murder charges. “We have recognized that the risk of undue
    prejudice is particularly great whenever joinder of counts
    allows evidence of other crimes to be introduced in a trial
    where the evidence would otherwise be inadmissible.” See
    Sandoval, 
    241 F.3d at
    772 (citing United States v. Lewis,
    
    787 F.2d 1318
    , 1322 (9th Cir.1986)); Davis, 
    384 F.3d at
    638–39 (finding no prejudice to the defendant when
    evidence was cross-admissible); Fields v. Woodford,
    
    309 F.3d 1095
    , 1109–10 (9th Cir. 2002) (same); United
    States v. Johnson, 
    820 F.2d 1065
    , 1070–71 (9th Cir. 1987)
    (same). For example, of the fifteen witnesses who testified
    at trial, only two—Shawnte Early and Shannon Senegal—
    allegedly witnessed more than one of the murders, and none
    of them allegedly witnessed all three murders. People v.
    58                    COOK V. KERNAN
    Cook, 
    139 P.3d 492
    , 502 (Cal. 2006). Similarly, the
    ballistics evidence for the Bettencourt and Morris murders
    was introduced together, even though the San Mateo
    Sheriff’s Department was unable to confirm that the casings
    and bullets recovered from both crime scenes originated
    from the same weapon. 
    Id. at 502
    . Most importantly,
    Cook’s highly prejudicial and unlawfully obtained
    confession, and other incriminating statements, were
    introduced at the joint trial for all three murders, even though
    they only pertained to the Bettencourt and Morris murders,
    respectively. None of these statements had anything to do
    with the Sadler murder.
    On direct appeal, the California Supreme Court
    nonetheless affirmed the trial court’s finding that
    “substantial cross-admissibility” of evidence existed
    between the Bettencourt and Morris murders because “those
    victims were killed by multiple shots fired from the same
    gun, which [D]efendant admitted was his.” 
    Id. at 505
    (emphases added). But, as discussed above, a San Mateo
    County Sheriff’s criminalist testified that it was impossible
    to link the casings recovered from the Morris and
    Bettencourt murders to the same gun, especially because no
    gun was ever recovered. Op. at 8. Cook, 
    139 P.3d at 502
    .
    Therefore, in order to link the gun to both murders, the
    prosecution had to rely on Cook’s incriminating statements
    that “he had used his [nine]-millimeter handgun to shoot
    Bettencourt and that on the day after the Morris shooting he
    had thrown the gun off the Dumbarton Bridge.” 
    Id.
     These
    incriminating statements should not have been admitted into
    evidence, however, because they were unlawfully obtained
    after Cook’s invalid Miranda waiver. Therefore, the state
    trial court had no legitimate justification or good cause to try
    these otherwise unrelated murders together. Lane, 
    474 U.S. at
    446 n. 8 (“[M]isjoinder would rise to the level of a
    COOK V. KERNAN                            59
    constitutional violation only if it results in prejudice so great
    as to deny a defendant his Fifth Amendment right to a fair
    trial.”); Bean, 
    163 F.3d at 1084
     (holding that defendant was
    highly prejudiced by the improper joint trial of otherwise
    unrelated crimes).
    Moreover, “there was no cross-admissibility between
    [the Sadler] murder and the [Bettencourt and Morris
    murders]” because Sadler was beaten rather than shot. 4
    Cook, 
    139 P.3d at 505
    . Therefore, in order to affirm the trial
    court’s denial of Cook’s motion to sever the trial for the
    Sadler murder, the California Supreme Court, on direct
    appeal, had to summarily conclude that the joinder of the
    Sadler murder did not prejudice Cook because the
    Bettencourt and Morris murders had already been properly
    joined into a single trial. 
    Id.
     But the Morris and Bettencourt
    murders were improperly joined using Cook’s unlawfully
    obtained confession and other incriminating statements, so
    the additional joinder of the Sadler murder—for which there
    was no cross-admissibility of evidence—was also improper
    and highly prejudicial.
    The reason the consolidation of the three unrelated
    murders into a single trial was harmful is that “the jury could
    not ‘reasonably [have been] expected to compartmentalize
    the evidence so that evidence of one crime [did] not taint the
    jury’s consideration of another crime.’” Bean 
    163 F.3d at 1084
     (quoting Johnson, 
    820 F.2d at 1071
    ); United States
    v. Douglass, 
    780 F.2d 1472
    , 1479 (9th Cir. 1986) (same).
    We have long observed that “[i]t is much more difficult for
    jurors to compartmentalize damaging information about one
    4
    Shawnte Early identified Cook as the man who repeatedly shot
    Bettancourt and who beat Sadler with a stick. Cook, 
    139 P.3d at
    505–
    06. However, she repudiated her pretrial statements on the stand. 
    Id.
    60                     COOK V. KERNAN
    defendant derived from joined counts, than it is to
    compartmentalize evidence against separate defendants
    joined for trial.” Lewis, 787 F.2d at 1322. Indeed, studies
    show that “joinder of counts tends to prejudice jurors’
    perceptions of the defendant and of the strength of the
    evidence on both sides of the case.” Id. Cook was entitled,
    under the Fifth Amendment, to three separate trials precisely
    to ensure that the jury in each of those trials was able to fairly
    evaluate the evidence of each unrelated murder, and not be
    prejudiced by their inability to compartmentalize the
    cumulative evidence of the other two murders. See Bean,
    
    163 F.3d at 1084
     (“As the joinder of the [] charges did in fact
    prejudice [the defendant’s] trial on the latter counts, we
    conclude that [the defendant’s] due process rights were
    violated.”).
    Indeed, the jurors in Cook’s case admit, in no uncertain
    terms, that they were unable to compartmentalize the
    evidence because their perception of it was tainted by
    Cook’s unlawfully obtained confession to the Bettencourt
    murder and his incriminating statements about the Morris
    murder. One juror stated: “[Cook] admitted to one of the
    killings, so it seemed likely that he had done the other two.”
    Another confirmed that “[a]fter hearing from all of these
    witnesses in the guilt phase, we heard Walter’s confessions
    about his involvement in the crimes,” notably failing to
    distinguish between the Bettencourt murder and the other
    two murders. In order to find that the admission of Cook’s
    confession and other incriminating statements was harmless,
    the state habeas court would have had to unreasonably
    ignore these deeply troubling statements from the jury.
    Accordingly, because the jury unfairly considered the
    cumulative evidence against Cook—rather than
    compartmentalizing the evidence for each unrelated
    COOK V. KERNAN                        61
    murder—no fairminded jurist would disagree that the trial
    court’s use of Cook’s confession to consolidate the three
    unrelated murders into a single trial had a “substantial and
    injurious effect or influence in determining the jury’s
    verdict.” Bean, 
    163 F.3d at 1086
     (quoting Brecht, 507 U.S
    at 637). This impermissible joinder, on its own, is sufficient
    to establish prejudice for purposes of granting Cook habeas
    relief.
    b. The admission of Cook’s confession and other
    incriminating statements was harmful
    because the other evidence against Cook was
    inconclusive or highly compromised.
    Even assuming the improper misjoinder of the three
    unrelated murders into a single trial did not prejudice Cook,
    the admission of his unlawfully obtained confession and
    other incriminating statements was not “harmless error”
    because the other evidence against Cook was most likely
    insufficient for the jury to convict him. Fulminante,
    
    499 U.S. at 297
     (reversing conviction and ordering a new
    trial because “[o]ur review of the record leads us to conclude
    that the State has failed to meet its burden of establishing,
    beyond a reasonable doubt, that the admission of
    [defendant’s] confession [] was harmless error”); Martinez
    v. Cate, 
    903 F.3d 982
    , 999 (9th Cir. 2018) (“[Defendant’s]
    improperly-admitted statements were clear and damning;
    they were the backbone of the State’s argument against self-
    defense. Thus, we have grave doubts that their admission
    did not affect the verdict.”); Anderson, 516 F.3d at 792 (9th
    Cir. 2008) (holding that “the error was not harmless[,]”
    because “[t]he confession was central to the conviction”
    (citing Brecht, 
    507 U.S. at 623
    , and then citing Fulminante,
    
    499 U.S. at 296
    )).
    62                   COOK V. KERNAN
    I will explain in turn how the other evidence of Cook’s
    guilt for each of the three murders was inconclusive and
    highly compromised.
    i. The Sadler murder
    For the Sadler murder, most of the evidence was
    inconclusive or highly compromised. For example, the three
    bystanders who testified against Cook—Ernest Woodard,
    Shawnte Early, and Velisha Sorooshian—admitted that they
    were coerced and threatened by the police in exchange for
    their testimony incriminating Cook. Their testimony was
    also inconclusive. Woodard never testified that he saw Cook
    beat Sadler to death with a stick. Cook, 
    139 P.3d at
    500–01.
    Early recanted at trial, testifying that she did not remember
    making the statement accusing Cook, that the statement was
    untrue, and that the police coerced her to make it. Similarly,
    Sorooshian admitted at trial that she could not remember the
    details of her interview with detectives because she “ha[d]
    been on crack so long.”
    The only other testimony against Cook was that of
    Shannon Senegal, who claims that Cook told him he beat up
    Sadler the day after the murder. But Senegal’s testimony is
    highly unreliable given that he was a suspect to the Morris
    killing, which means he had a strong incentive to see Cook
    take the blame for both crimes. Cook, 139 P.23d at 501. In
    fact, Senegal’s charge as an accessory to the Morris murder
    was dropped for a misdemeanor count of giving false
    information to a peace officer in exchange for his statement
    incriminating Cook in the Sadler murder.
    There was also substantial forensic and testimonial
    evidence that Thomas Young and his cousin Kenny Young,
    not Cook, killed Sadler. Frankly, given this evidence, it is
    baffling that the detectives investigating the Sadler murder
    COOK V. KERNAN                        63
    failed to interview Thomas Young until May 2, 1994—over
    two years after Sadler’s death, and sixteen days into Cook’s
    trial. Detectives never interviewed Kenny Young. This
    means that the jury was never presented with the available
    evidence against all the credible suspects to the murder; they
    were only presented with highly compromised evidence of
    Cook’s alleged involvement.
    Considering these serious evidentiary pitfalls,
    fairminded jurists would have to agree that the jury had to
    rely on Cook’s improperly admitted confession and other
    incriminating statements to convict Cook of the Sadler
    murder.
    ii. The Bettencourt murder.
    Virtually every piece of evidence of the Bettencourt
    murder is either inconclusive or highly compromised. For
    example, Tamika Asburry, Shawnte Early, Teresa Beasley,
    and Darnell Earby, who gave statements to the police
    identifying Cook as Bettencourt’s shooter, later recanted at
    trial, stating that their statements had been coerced and
    reflected what the police wanted them to say. Nathan
    Gardner and Keith Johnson also testified that they saw Cook
    shoot Bettencourt.        However, their testimony was
    inconclusive because both witnesses initially admitted they
    could not definitely identify Cook as Bettencourt’s shooter,
    even though they both later testified that they did see Cook
    shoot Bettencourt. Importantly, Gardner and Johnson
    received lenient plea deals in unrelated charges for violent
    drug crimes as a result of their testimony against Cook.
    The other witness who accused Cook of shooting
    Bettencourt was Sims, who was the only other suspect to the
    murder. Sims admitted that he was also on the scene selling
    crack, and he was kneeling inside the victim’s car (where he
    64                    COOK V. KERNAN
    allegedly dropped a crack rock) moments before the
    shooting began. In fact, there is compelling ballistics
    evidence suggesting that the first shot could only have come
    from Sims’s location, and that because every shot came from
    the same gun, there is at least some probability that Sims, not
    Cook, shot Bettencourt.
    Moreover, although Sims testified on the stand that he
    hoped to receive a lighter sentence for his multiple parole
    and drug charges in exchange for his testimony against
    Cook, he neglected to share with defense counsel and the
    jury that he had already received a very generous deal. In
    fact, Inspector Sabin wrote to the Board of Prisons to ensure
    that Sims was released on his own recognizance from a
    prison sentence for parole violations on two occasions—July
    1992 and May 1993. After Sims violated the terms of his
    supervised release a third time, his probation officer,
    Timothy Gatto, had to write to the San Mateo Superior Court
    seeking a bench warrant, describing Sims as “clearly out of
    control” and noting that “his veracity is questionable in all
    matters.” Ultimately Sims secured a two-year get-out-of-
    jail-free pass for his multiple parole violations and drug
    offenses in exchange for his testimony incriminating Cook.
    It is thus extremely problematic that the prosecution only
    turned over Sabin’s letters to the Board of Prisons after
    Sims’ trial testimony, and never turned over Gatto’s letter.
    Had the prosecution turned over this key evidence showing
    that Sims received special treatment in exchange for his
    testimony against Cook, there is a reasonable probability that
    the jury would have concluded that Sims seriously lacked
    credibility. But the opposite happened. One of the jurors
    explained that “there was one guy in particular we really
    liked, a young man named Jap [Sims’s nickname],” who
    “wanted to help the police with the case because he was
    trying to turn his life around.”
    COOK V. KERNAN                             65
    Therefore, the district court correctly found that the
    witness statements identifying Cook as the Bettencourt
    shooter were “compromised,” either due to alleged police
    misconduct in feeding details or threatening the witnesses,
    or because the witness was also a suspect and thus had a
    motive to fabricate. Without the confession to the
    Bettencourt murder, it is highly likely that the jury would
    have viewed this evidence in a substantially less prejudicial
    way.
    iii. The Morris murder.
    The evidence for the Morris murder is even more
    problematic. Two of the witnesses who testified that they
    saw Cook shoot Morris—Lavert Branner and Shannon
    Senegal—were themselves suspects and granted leniency by
    the prosecution for testifying against Cook. 5 Furthermore,
    there was strong forensic and testimonial evidence that
    Branner or Senegal killed Morris, including testimony from
    Monique Barrett, Lakishain Smith, and Tasha Bradford.
    In sum, the evidence against Cook for the Sadler,
    Bettencourt, and Morris murders was so lacking that there is
    “more than a ‘reasonable possibility’ that” the admission of
    Cook’s confession to the Bettencourt murder and other
    incriminating statements about the Morris murder was
    “harmful” under Brecht. Ayala, 
    135 S. Ct. at 2198
     (quoting
    507 U.S. at 637). The prosecution’s case for all three
    murders was otherwise flimsy and weak. In fact, without
    Cook’s unlawfully obtained confession and other
    5
    It is highly problematic that the police waited over a year to
    interview Branner and Senegal about the Morris killing given that they
    were both natural suspects. The police spoke with Branner for the first
    time in November 1993, and with Senegal in March 1994.
    66                       COOK V. KERNAN
    incriminating statements, the remaining evidence consists of
    recanted, coerced, or otherwise compromised testimony, and
    inconclusive ballistics evidence. Therefore, “absent the
    confessions, it is unlikely that [Cook] would have been
    prosecuted at all, because the physical evidence from the
    scene and other circumstantial evidence would have been
    insufficient to convict.” Fulminante, 
    499 U.S. at 297
    .
    Furthermore, because the trial court admitted the
    unlawfully obtained confession and other incriminating
    statements, Cook’s defense counsel was forced to
    acknowledge that Cook shot Bettencourt, focusing their
    efforts instead on establishing that Bettencourt’s killing was
    at most second-degree murder because Cook had been
    drinking heavily. Cook, 
    139 P.3d at 502
    . In other words,
    had the confession and statements not been admissible, the
    defense would not have had to acknowledge that Cook shot
    Bettencourt. It is thus highly likely that Cook’s defense
    counsel would have attempted to convince the jury that Cook
    did not shoot Bettencourt, especially because the
    prosecution’s case was otherwise unconvincing.
    Cook’s wrongfully admitted confession and other
    incriminating statements were highly prejudicial. 6 In
    Fulminante, the Supreme Court warned us, in no uncertain
    terms, that we must “exercise extreme caution before
    determining that the admission of a confession at trial was
    harmless,” because confessions “may tempt the jury to rely
    upon that evidence alone in reaching its decision.” 
    499 U.S. at 296
    . Here, the inconclusive and highly compromised
    6
    Judge Callahan filed a concurrence, in which Judge Smith did not
    join, arguing that “the state habeas court could have reasonably denied
    Cook’s claim on the basis that the admission of his confession did not
    prejudice him at trial.”
    COOK V. KERNAN                       67
    evidence in the record, coupled with the deeply troubling
    post-trial statements of the jurors, give me—and should give
    this Court—“grave doubt about whether [the impermissible
    admission of Cook’s unlawfully obtained confession and
    other admissions] had a substantial and injurious effect or
    influence in determining the jury’s verdict.” Ayala, 
    135 S. Ct. at
    2197–98 (quoting O’Neal, 
    513 U.S. at 436
    ).
    4. Conclusion
    Cook is entitled to habeas relief because the California
    Supreme Court’s summary ruling that he intelligently and
    knowingly waived his Miranda rights involved an
    unreasonable determination of the facts and an unreasonable
    application of clearly established federal law, given that he
    was not—indeed he could not be—“full[y] aware[] of both
    the nature of the right being abandoned and the
    consequences of the decision to abandon it.” Thompkins,
    
    560 U.S. at 384
     (quoting Burbine, 
    475 U.S. at 421
    ).
    Furthermore, the record clearly shows that the admission
    of Cook’s unlawfully obtained confession to the Bettencourt
    murder and incriminating statements about the Morris
    murder were harmful. First, the admission of these
    unlawfully obtained incriminating statements resulted in a
    fundamentally unfair joint trial of the three unrelated
    murders of Sadler, Bettencourt, and Morris, during which
    the jury failed to compartmentalize the evidence for each
    crime, violating Cook’s due process rights. Second, the
    record highlights that the prosecution’s other evidence of
    Cook’s guilt was inconclusive or highly compromised,
    which led the jury to rely heavily on Cook’s unlawfully
    obtained incriminating statements to convict him.
    Accordingly, I respectfully dissent.