Leon Winston v. Eddie Pearson ( 2012 )


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  •                        PUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    LEON J. WINSTON,                       
    Petitioner-Appellee,
    v.
          No. 11-4
    EDDIE L. PEARSON, Warden, Sussex
    I State Prison,
    Respondent-Appellant.
    
    LEON J. WINSTON,                       
    Petitioner-Appellant,
    v.
          No. 11-5
    EDDIE L. PEARSON, Warden, Sussex
    I State Prison,
    Respondent-Appellee.
    
    Appeals from the United States District Court
    for the Western District of Virginia, at Roanoke.
    Samuel G. Wilson, District Judge.
    (7:07-cv-00364-SGW)
    Argued: May 15, 2012
    Decided: June 25, 2012
    Before GREGORY, DUNCAN, and DIAZ, Circuit Judges.
    Affirmed by published opinion. Judge Diaz wrote the opinion,
    in which Judge Gregory and Judge Duncan joined.
    2                     WINSTON v. PEARSON
    COUNSEL
    ARGUED: Katherine Baldwin Burnett, OFFICE OF THE
    ATTORNEY GENERAL OF VIRGINIA, Richmond, Vir-
    ginia, for Appellant/Cross-Appellee. Jennifer Leigh Givens,
    FEDERAL COMMUNITY DEFENDER OFFICE, Philadel-
    phia, Pennsylvania, for Appellee/Cross-Appellant. ON
    BRIEF: Kenneth T. Cuccinelli, II, Attorney General of Vir-
    ginia, Richmond, Virginia, for Appellant/Cross-Appellee.
    Leigh M. Skipper, Chief Federal Defender, James Moreno,
    Aren Adjoian, FEDERAL COMMUNITY DEFENDER
    OFFICE, Philadelphia, Pennsylvania, for Appellee/Cross-
    Appellant.
    OPINION
    DIAZ, Circuit Judge:
    A Virginia jury convicted Leon Winston of capital murder.
    The court, following the jury’s recommendation, sentenced
    Winston to death. Winston’s direct appeals failed and his con-
    viction became final, at which point he sought habeas relief
    in state court. The Supreme Court of Virginia denied relief,
    rejecting Winston’s requests for discovery and an evidentiary
    hearing.
    Winston then filed a habeas petition in federal court. The
    district court granted him an evidentiary hearing to explore
    whether his trial attorneys were ineffective for failing to raise
    the claim under Atkins v. Virginia, 
    536 U.S. 304
     (2002), that
    his mental retardation categorically barred imposition of a
    death sentence. But the court, after presiding over the hearing,
    reversed course and held that it was precluded from consider-
    ing any evidence adduced during the federal proceeding.
    Looking only to facts presented in the state habeas proceeding
    and conducting a deferential review of the state-court deci-
    WINSTON v. PEARSON                            3
    sion, the court denied Winston’s petition for habeas relief.
    Winston v. Kelly, 
    600 F. Supp. 2d 717
    , 722–23 (W.D. Va.
    2009).
    We vacated in part the district court’s decision on appeal,
    ordering it to conduct a de novo review of Winston’s ineffec-
    tiveness claim while entertaining the evidence offered during
    the federal hearing. Winston v. Kelly (Winston I), 
    592 F.3d 535
    , 553 (4th Cir. 2010). On remand, the district court granted
    Winston’s petition for habeas relief and vacated his death sen-
    tence. Winston v. Kelly, 
    784 F. Supp. 2d 623
    , 626 (W.D. Va.
    2011). Virginia timely filed this appeal.
    The Commonwealth contends principally that intervening
    Supreme Court precedent has eroded the foundation of our
    prior opinion in Winston I, compelling us to forgo de novo
    review and instead accord substantial deference to the
    Supreme Court of Virginia’s decision denying habeas relief.
    Under the appropriate standard, maintains the Common-
    wealth, Winston’s habeas petition lacks merit.
    We disagree and find nothing in recent Supreme Court
    decisions that calls into question our reasoning in Winston I,
    which, as law of the case, we may not lightly disturb. Review-
    ing Winston’s ineffectiveness claim de novo, we agree with
    the district court that Winston has established that his trial
    attorneys rendered deficient performance that prejudiced him.
    We therefore affirm the district court’s grant of habeas relief.1
    I.
    A.
    On the morning of April 19, 2002, two men broke into
    Rhonda and Anthony Robinson’s home and killed them.
    1
    As we explain below, we reject Winston’s cross-appeal and affirm the
    district court’s judgment as to remedy.
    4                     WINSTON v. PEARSON
    Police later arrested Winston, and the Commonwealth
    charged him with capital murder and several lesser crimes.
    Winston proceeded to trial, at which a jury found him guilty
    of capital murder and related crimes.
    During the sentencing phase of the trial, Winston’s attor-
    neys presented records of his psychological evaluations and
    testimony about his family history. The attorneys used the
    records and testimony as ordinary mitigating evidence to illu-
    minate Winston’s troubled childhood and subaverage intellec-
    tual functioning, but not to establish mental retardation. At the
    conclusion of the sentencing proceeding, the jury recom-
    mended a sentence of death for each of the murders. Agreeing
    with the jury’s recommendation, the court sentenced Winston
    to death. The Supreme Court of Virginia affirmed the convic-
    tions, and the U.S. Supreme Court denied Winston’s petition
    for certiorari.
    B.
    Winston filed a habeas petition in the Supreme Court of
    Virginia, raising dozens of claims. Refusing—without expla-
    nation—Winston’s requests for an evidentiary hearing and
    discovery, the Supreme Court of Virginia denied all relief.
    Germane to this appeal, the court rejected Winston’s Atkins
    and Atkins-related claims. Winston maintained that Atkins
    barred his execution because he met Virginia’s statutory defi-
    nition of mental retardation. In support of this contention,
    Winston offered a Fairfax County Public Schools special-
    education eligibility reclassification form ("Reclassification"),
    which indicated that school officials had reclassified him as
    mentally retarded. He was unable to proffer any IQ scores or
    other data on which counselors relied to make this determina-
    tion. Winston also submitted the scores of three IQ tests, all
    of which exceeded 70, the maximum score that Virginia
    accepts as evidence of mental retardation.
    WINSTON v. PEARSON                       5
    The Supreme Court of Virginia first held that Winston’s
    Atkins claim, raised for the first time in the habeas petition,
    was barred for failure to exhaust. It then considered whether
    the failure of Winston’s trial attorneys to present evidence of
    his mental retardation amounted to ineffectiveness of counsel,
    such that it would excuse the procedural default. The court
    answered this query in the negative, concluding that Winston
    had "failed to demonstrate that counsel’s performance was
    deficient or that there is a reasonable probability that, but for
    counsel’s alleged error, the result of the proceeding would
    have been different." J.A. 306. It found no evidence that Win-
    ston had been "diagnosed as being mentally retarded before
    the age of 18 in accordance with the legal definition of mental
    retardation established by the legislature." 
    Id.
     305–06. None
    of the three IQ scores presented to the court were 70 or below,
    which precluded Winston from meeting the state’s criteria for
    mental-retardation classification. Although Winston presented
    the Reclassification, the court noted that students may be clas-
    sified as mentally retarded for educational purposes even if
    they have an IQ above 70.
    C.
    1.
    Winston next filed a habeas petition in the U.S. District
    Court for the Western District of Virginia, pursuant to 
    28 U.S.C. § 2254
    . Winston’s petition raised in excess of thirty
    claims. In an initial decision, the court rejected all of the
    claims save for his Atkins and Atkins-related claims. As to
    those, the court "conclude[d] that an evidentiary hearing [was]
    appropriate to determine whether counsel rendered ineffective
    assistance at sentencing both as a free-standing claim and as
    cause and prejudice to excuse procedural default of Winston’s
    Atkins claim." J.A. 611. Winston’s diligence in pursuing the
    claims, combined with the real possibility that he could pre-
    vail even under the deferential standards of the Antiterrorism
    and Effective Death Penalty Act ("AEDPA"), confirmed the
    6                     WINSTON v. PEARSON
    propriety of ordering an evidentiary hearing, reasoned the
    court.
    Winston used the evidentiary hearing to sharpen his
    ineffective-assistance-of-counsel claim. Most crucial, the
    hearing enabled Winston to produce for the first time a 1997
    IQ test, taken when he was sixteen years old, reflecting a
    score of 66. Because Virginia law mandates that an individual
    prove an IQ of 70 or below to support his classification as
    mentally retarded, presentation of the 1997 test was vital to
    Winston’s Atkins ineffectiveness claim.
    The attorneys who represented Winston at trial, Glenn Ber-
    ger and B. Leigh Drewry, Jr., testified at the evidentiary hear-
    ing. Although they obtained Winston’s educational records
    from Fairfax County Public Schools, neither Berger nor
    Drewry read the complete records. Instead, they sent them to
    Dr. Evan Nelson, Winston’s court-appointed mental-health
    expert. The attorneys testified that they had no strategic rea-
    son for neglecting to review the records prior to forwarding
    them to Nelson. Included in the records that counsel failed to
    review was the Reclassification, which reflected school offi-
    cials’ determination that Winston was mentally retarded. As
    Drewry, who led preparation for the penalty phase of the trial,
    testified, review of the Reclassification would have prompted
    him to investigate Winston’s mental retardation.
    Not only did counsel not review Winston’s school records,
    they failed to interview any of Winston’s teachers or counsel-
    ors at the school. At the evidentiary hearing, several school
    officials recounted their experiences with Winston, which
    convinced them of his severe limitations in cognitive func-
    tioning. These officials would have testified during Winston’s
    sentencing hearing, but his attorneys never sought them out.
    Marilynn Lageman, one such official, would have provided
    evidence of Winston’s 66 IQ score had she been contacted by
    Winston’s attorneys. Although the result of that test was not
    included in the school records obtained by counsel, Lageman
    WINSTON v. PEARSON                              7
    testified that the score was saved on a computer disk in her
    office at the time of the trial. Because she was a school psy-
    chologist who was actively involved with Winston’s educa-
    tion, Lageman’s name appeared on some of the records
    obtained by counsel. Drewry testified that he would have
    interviewed Lageman if he had seen the records listing her
    name.
    Nelson, Winston’s court-appointed mental-health expert,
    testified about his evaluation of Winston’s case. Based on the
    information at his disposal, Nelson concluded at the time of
    trial that Winston likely did not satisfy the diagnostic criteria
    for mental retardation under Virginia law. Although he
    reviewed the school records obtained by counsel, Nelson did
    not recall specifically considering the Reclassification. He
    stated that a closer review of that form along with receipt of
    information from Winston’s school teachers and counselors
    would have been important to his analysis. Indeed, had Nel-
    son noticed the Reclassification, he would have investigated
    the circumstances surrounding it. For his part, Drewry stated
    that he would have followed up with Nelson and brought the
    Reclassification to his attention, had he noticed it. Nelson fur-
    ther testified that the 66 IQ score would have been significant
    to his analysis. In sum, Nelson stated that consideration of the
    Reclassification, the 66 IQ score, and information from Win-
    ston’s school teachers and counselors could have impelled
    him to determine that Winston was, in fact, mentally retarded
    under state law. "It’s certainly possible," testified Nelson, "my
    opinion might have been different with this wealth of other
    information." 
    Id. 720
    .2
    As it played out at trial, however, Winston’s attorneys
    2
    Two other experts submitted reports for use in the evidentiary hearing.
    Dr. Daniel Reschly, Winston’s expert, determined that Winston was men-
    tally retarded under Virginia law. The Commonwealth countered with a
    report from Dr. Leigh Hagan, who concluded that Winston was not men-
    tally retarded pursuant to Virginia law.
    8                     WINSTON v. PEARSON
    decided not to call Nelson to testify. Drewry felt that Nelson’s
    testimony would in fact damage Winston’s case, as it would
    allow the Commonwealth to introduce Nelson’s conclusions
    that Winston exhibited antisocial behavior and had a capacity
    for future dangerousness. Berger and Drewry thus chose not
    to press the claim that Winston was mentally retarded under
    Virginia law.
    Though the district court allowed Winston to develop his
    Atkins and Atkins-related claims at an evidentiary hearing, it
    ultimately determined that it could not consider any of the
    evidence produced for the first time in the federal arena. Find-
    ing that the 66 IQ score "fundamentally alter[ed] Winston’s
    ineffective assistance claim and [Winston] [could not]
    account for his failure to present it to the Supreme Court of
    Virginia," the court held that Winston failed to exhaust the
    newly positioned claim, constraining it to consider the claim
    only "as it was fairly positioned before the Supreme Court of
    Virginia." Winston, 
    600 F. Supp. 2d at 722
    .
    The district court moreover noted that the state-court deci-
    sion qualified as an adjudication on the merits, requiring it to
    apply the deferential standards of 
    28 U.S.C. § 2254
    (d). View-
    ing only the evidence presented in state court through the
    prism of § 2254(d), the court concluded that "the Supreme
    Court of Virginia’s adjudication on the merits of Winston’s
    ineffective assistance claim, at least as to Strickland’s [Strick-
    land v. Washington, 
    466 U.S. 668
     (1984)] prejudice prong,
    was not unreasonable." Winston, 
    600 F. Supp. 2d at 723
    . The
    court consequently denied Winston’s habeas petition.
    2.
    We vacated in part the district court’s decision on appeal,
    deeming erroneous its denial of Winston’s Atkins and Atkins-
    related claims but affirming on all other grounds. We first
    held that "it was error for the district court to refuse to con-
    sider [the 66 IQ score] because the score does not fundamen-
    WINSTON v. PEARSON                       9
    tally alter Winston’s claims and because habeas counsel was
    diligent in searching for it." Winston I, 
    592 F.3d at 539
    .
    Explaining that a district court may "consider new evidence
    if it supports factual allegations for which there is already at
    least some support in the state record," we concluded that
    Winston had cleared this bar by "offer[ing] some evidence in
    state court to support the factual claim that he possesses sig-
    nificantly sub-average intellectual functioning as measured by
    a standardized test." 
    Id. at 550
    . And because Winston was dil-
    igent in seeking the evidence to support his Atkins and Atkins-
    related claims, we determined that the court on remand was
    required to consider the claims with the 66 IQ score as evi-
    dence.
    We then weighed the appropriate standard under which the
    district court was required to review the state-court denial of
    Winston’s habeas petition. We ultimately concluded that def-
    erence to the Supreme Court of Virginia’s decision was
    unwarranted under § 2254(d), because that court had not adju-
    dicated Winston’s claims on the merits. The district court was
    obligated, however, to extend deference to any relevant fac-
    tual findings made by the state court, as provided in
    § 2254(e)(1).
    That the Supreme Court of Virginia did not adjudicate
    Winston’s Atkins ineffectiveness claim on the merits served as
    the linchpin of our decision. We reasoned that, when a state
    court does not adjudicate a claim on the merits, AEDPA def-
    erence is inappropriate and a federal court must review the
    claim de novo. Whether a claim has been adjudicated on the
    merits is a case-specific inquiry, and we consequently rejected
    Winston’s entreaties to hold that § 2254(d) "will never apply
    once the district court has granted an evidentiary hearing." Id.
    at 553. But when a state court unreasonably refuses to permit
    "further development of the facts" of a claim, de novo review
    might be appropriate:
    [W]hen a state court forecloses further development
    of the factual record, it passes up the opportunity that
    10                    WINSTON v. PEARSON
    exhaustion ensures. If the record ultimately proves to
    be incomplete, deference to the state court’s judg-
    ment would be inappropriate because judgment on a
    materially incomplete record is not an adjudication
    on the merits for purposes of § 2254(d). New, mate-
    rial evidence, introduced for the first time during
    federal habeas proceedings, may therefore require a
    de novo review of petitioner’s claim.
    Id. at 555–56 (citations omitted). Lest our holding be viewed
    as a pliable safety valve for habeas petitioners, we reiterated
    that "the requirements that petitioners exhaust their state rem-
    edies and diligently develop the record in state court are
    exacting burdens." Id. at 556. Indeed, new evidence submitted
    in federal court that fundamentally alters a claim presented in
    state court will render that claim unexhausted. Similarly, that
    a petitioner requested an evidentiary hearing from the state
    court, without more, might not always suffice to satisfy
    AEDPA’s diligence requirement.
    Turning to the facts of Winston’s case, we determined that
    the Supreme Court of Virginia had not adjudicated his Atkins
    ineffectiveness claim on the merits. We first reasoned that
    Winston’s 66 IQ score "is material to whether he is retarded
    under Virginia law and therefore material to whether he was
    prejudiced . . . by his counsel’s conduct." Id. at 557. We
    stressed that the state court "had its opportunity to consider a
    more complete record, but chose to deny Winston’s request
    for an evidentiary hearing." Id. at 553. The state court’s denial
    of discovery and an evidentiary hearing produced an adjudica-
    tion of "a claim that was materially incomplete." Id. at 557.
    And because the ineffectiveness analysis requires a "collec-
    tive evaluation of the evidence rather than an analysis con-
    fined to a subset of the facts," we concluded that the state
    court’s legal conclusions were not "neatly separable into those
    based on a complete record and those based on an incomplete
    record." Id. We accordingly instructed the district court to
    WINSTON v. PEARSON                     11
    extend no deference under AEDPA to the Supreme Court of
    Virginia’s application of the ineffectiveness standards.
    Relevant factual findings made by the Supreme Court of
    Virginia were entitled to deference under § 2254(e)(1), we
    acknowledged. Such findings included those made on the
    basis of Winston’s three above-70 IQ scores and the standards
    used by the Fairfax County Public Schools when assessing
    whether a student is mentally retarded. But "[w]here the
    [Supreme Court of Virginia] did not make a factual finding,"
    we instructed the district court to "make its own without
    regard to what the state court might have done." Id.
    3.
    On remand, the district court granted Winston’s habeas
    petition as to his Atkins ineffectiveness claim. The court first
    concluded that Winston’s trial attorneys rendered deficient
    performance for failing to review the school records and con-
    duct follow-up investigations on the legal issues implicated by
    the documents. It adjudged the deficiency prejudicial, ascer-
    taining a "reasonable probability that but for counsel’s unpro-
    fessional errors, the outcome of Winston’s proceeding would
    have been different"—i.e., he would not have been sentenced
    to death. Winston, 
    784 F. Supp. 2d at 626
    . Heeding our direc-
    tive in Winston I, the court accorded § 2254(e)(1) deference
    to two factual findings of the state court: that Winston
    achieved scores of 77, 76, and 73 on three IQ tests; and that
    he could have been reclassified as mentally retarded by school
    officials even without scoring 70 or below on an IQ test. In
    its statement of remedy, the court ordered the Commonwealth
    to "conduct a trial on the question of whether Winston is men-
    tally retarded, and sentence him accordingly, or otherwise
    resentence him without the possibility of death." Id. at 635.
    Challenging the form of relief, Winston moved to alter or
    amend the judgment so that the court would expressly grant
    him a full sentencing retrial, not merely a limited trial on
    12                       WINSTON v. PEARSON
    mental retardation. The court denied Winston’s motion. It first
    acknowledged that its "notation concerning the consequences
    of [its] decision is essentially surplusage," as it lacked author-
    ity to describe with precision the steps that the Common-
    wealth must take to comply with its mandate. Supp. J.A. 35.
    In any event, reasoned the court, its "wording [of the remedy]
    was intended to make it plain that Virginia could comply with
    the writ without conducting a full resentencing." Id.
    These appeals followed.
    II.
    To effectuate a regime that embraces federalism in the
    habeas realm, AEDPA carefully circumscribes federal review
    of the habeas claims of state prisoners. The statute erects a
    formidable obstacle to state prisoners seeking to disturb state-
    court habeas decisions:
    (d)   An application for a writ of habeas corpus on
    behalf of a person in custody pursuant to the
    judgment of a State court shall not be granted
    with respect to any claim that was adjudicated
    on the merits in State court proceedings unless
    the adjudication of the claim—
    (1)   resulted in a decision that was con-
    trary to, or involved an unreasonable
    application of, clearly established
    Federal law, as determined by the
    Supreme Court of the United States;
    or
    (2)   resulted in a decision that was based
    on an unreasonable determination of
    the facts in light of the evidence pre-
    sented in the State court proceeding.
    WINSTON v. PEARSON                       13
    
    28 U.S.C. § 2254
    (d). "[A] determination of a factual issue
    made by a State court shall be presumed to be correct" in such
    a case, with the petitioner bearing "the burden of rebutting the
    presumption of correctness by clear and convincing evi-
    dence." 
    Id.
     § 2254(e)(1).
    We consider the Commonwealth’s appeal against the back-
    drop of AEDPA and our prior opinion in this case.
    III.
    We turn first to determine the amount of deference properly
    accorded the Supreme Court of Virginia’s decision denying
    Winston’s habeas petition. It is critical, at the outset, to frame
    the bounds of our inquiry, constrained as it is by the law-of-
    the-case doctrine. We are not writing on a blank slate, at lib-
    erty to revisit our decision in Winston I on a whim. Winston
    I, as the law of the case, "‘continue[s] to govern the same
    issues in subsequent stages in the same case,’" TFWS, Inc. v.
    Franchot, 
    572 F.3d 186
    , 191 (4th Cir. 2009) (quoting United
    States v. Aramony, 
    166 F.3d 655
    , 661 (4th Cir. 1999)), and we
    will not "reconsider our previous holding" absent "extraordi-
    nary circumstances," Athridge v. Aetna Cas. & Sur. Co., 
    604 F.3d 625
    , 632 (D.C. Cir. 2010) (alteration and internal quota-
    tions omitted). Thus our legal conclusions in Winston I are
    subject to challenge only, as is relevant here, if "‘controlling
    authority has since made a contrary decision of law applicable
    to the issue.’" TFWS, Inc., 
    572 F.3d at 191
     (quoting Aramony,
    
    166 F.3d at 661
    ).
    The Commonwealth contends that intervening Supreme
    Court precedent has impeached the legal framework of Win-
    ston I, compelling us to review the state-court decision under
    § 2254(d)’s unreasonableness standard. According to the
    Commonwealth, Cullen v. Pinholster, 
    131 S. Ct. 1388
     (2011),
    and Harrington v. Richter, 
    131 S. Ct. 770
     (2011), establish
    that the Supreme Court of Virginia’s denial of Winston’s
    14                    WINSTON v. PEARSON
    habeas claims was an adjudication on the merits, entitled to
    substantial deference under AEDPA.
    As we explain below, we are not persuaded by the Com-
    monwealth’s interpretation of Pinholster and Richter. Neither
    case expressly delineates the contours of an "adjudication on
    the merits" for AEDPA purposes, and we require more than
    conjecture about the views of the Supreme Court before we
    retreat from a decision that is the law of the case. Our deci-
    sion in Winston I therefore endures. The Supreme Court of
    Virginia’s denial of Winston’s Atkins ineffectiveness claim
    was not an "adjudicat[ion] on the merits" under § 2254(d).
    We must consequently proceed to review the claim de novo.
    A.
    The Commonwealth anchors its argument in its reading of
    Pinholster and Richter. A review of these cases will accord-
    ingly focus our analysis.
    The Supreme Court in Pinholster reviewed the Ninth Cir-
    cuit’s grant of habeas relief to a California prisoner. The
    Supreme Court of California unanimously and summarily dis-
    missed two habeas petitions submitted by Pinholster. Pinhol-
    ster, 131 S. Ct. at 1396–97. Pinholster sought habeas relief in
    federal court, and the district court held an evidentiary hearing
    and granted his petition. Id. at 1397. The Ninth Circuit
    affirmed en banc, holding that new evidence adduced at a fed-
    eral evidentiary hearing could be considered in performing
    analysis under § 2254(d)(1). Id.
    Holding that "review under § 2254(d)(1) is limited to the
    record that was before the state court that adjudicated the
    claim on the merits," the Supreme Court rejected the Ninth
    Circuit’s construction of AEDPA and reversed. Id. at 1398.
    The Court characterized § 2254(d)(1)’s language as
    "backward-looking" and "requir[ing] an examination of the
    state-court decision at the time it was made." Id. "It follows,"
    WINSTON v. PEARSON                             15
    continued the Court, "that the record under review is limited
    to the record in existence at that same time i.e., the record
    before the state court." Id. Summarizing its discussion, the
    Court wrote, "If a claim has been adjudicated on the merits by
    a state court, a federal habeas petitioner must overcome the
    limitation of § 2254(d)(1) on the record that was before the
    state court." Id. at 1400.
    The Court rejected the argument that its holding rendered
    § 2254(e)(2)3 superfluous, in that § 2254(d) would now
    impose a wholesale bar on federal evidentiary hearings,
    affording § 2254(e)(2) no independent significance. It rea-
    soned that § 2254(e)(2) "continues to have force where
    § 2254(d)(1) does not bar federal habeas relief," as when a
    habeas claim does not fall under its compass because it was
    not adjudicated on the merits in state court. Id. at 1401.
    Applying the foregoing principles to Pinholster’s petition,
    the Court held that § 2254(d) controlled the case. Id. at 1402.
    Pinholster’s ineffectiveness claim had been adjudicated on the
    merits in state court, and the parties agreed that the federal
    claim was the same as that included in his state petitions. Id.
    Though the Supreme Court of California summarily adjudi-
    cated Pinholster’s petitions, the Court held that § 2254(d) "ap-
    plies even where there has been a summary denial." Id.
    Justice Sotomayor’s dissent explored the reach of the
    majority’s analysis. She first expressed agreement with the
    majority’s rejection of an approach apparently advanced by
    some circuit courts. Citing Winston I, Justice Sotomayor
    asserted, "Some courts have held that when a federal court
    3
    Section 2254(e)(2) cabins a federal habeas court’s discretion to grant
    an evidentiary hearing where a habeas petitioner "has failed to develop the
    factual basis of a claim in State court proceedings." As we concluded in
    Winston I, § 2254(e)(2) does not apply to Winston, as he was diligent in
    pursuing his Atkins ineffectiveness claim in state court. 
    592 F.3d at
    551–52.
    16                       WINSTON v. PEARSON
    admits new evidence supporting a claim adjudicated on the
    merits in state court, § 2254(d)(1) does not apply at all and the
    federal court may review the claim de novo." Id. at 1417
    (Sotomayor, J., dissenting). "[A]gree[ing] with the majority’s
    rejection of this approach," Justice Sotomayor reasoned that
    endorsing this practice "would undermine the comity princi-
    ples motivating AEDPA" by authorizing federal habeas courts
    to "decline to defer to a state-court adjudication of a claim
    because the state court, through no fault of its own, lacked all
    the relevant evidence." Id. She limited her rejection of the
    approach to claims adjudicated on the merits in state court,
    "assum[ing] that the majority does not intend to suggest that
    review is limited to the state-court record when a petitioner’s
    inability to develop the facts supporting his claim was the
    fault of the state court itself." Id. n.5. And even when a claim
    was adjudicated on the merits in state court, Justice Soto-
    mayor pointed to "situations in which new evidence support-
    ing" such a claim "gives rise to an altogether different claim"
    that is not subject to the strictures of § 2254(d)(1). Id.
    Dialogue between Justice Sotomayor and the majority shed
    light on the Court’s holding in Pinholster. Justice Sotomayor
    proffered a hypothetical in her dissent: A petitioner diligently
    attempts in state court to develop the factual foundation of a
    claim that prosecutors withheld Brady4 material. The state
    court denies relief on the grounds that the withheld evidence
    produced does not rise to a sufficient level of materiality.
    After its disposition, the state court orders the state to disclose
    additional documents that the petitioner had timely requested.
    The disclosed documents reveal that the state withheld other
    Brady material, but state law prevents the petitioner from pre-
    senting this new evidence in a successive habeas petition. Jus-
    tice Sotomayor wondered whether the majority’s holding
    would allow the petitioner to bolster his Brady claim, which
    was already adjudicated on the merits by the state court, in
    federal habeas court. Id. at 1417–18.
    4
    Brady v. Maryland, 
    373 U.S. 83
     (1963).
    WINSTON v. PEARSON                      17
    Responding to Justice Sotomayor’s hypothetical, the major-
    ity first declined "to draw the line between new claims and
    claims adjudicated on the merits." 
    Id.
     at 1401 n.10. It then
    recognized that Justice Sotomayor’s hypothetical "may well
    present a new claim" not subject to § 2254(d). Id.
    In Richter, the Court briefly added gloss to AEDPA’s "ad-
    judicated on the merits" requirement. "When a federal claim
    has been presented to a state court and the state court has
    denied relief," the Court declared that "it may be presumed
    that the state court adjudicated the claim on the merits in the
    absence of any indication or state-law procedural principles to
    the contrary." Richter, 
    131 S. Ct. at
    784–85. That a state court
    fails to attach an explanation to its decision does not preclude
    its classification as an adjudication on the merits. 
    Id. at 785
    .
    B.
    Closely scrutinizing the import of Pinholster and Richter,
    we find nothing in those decisions that renders infirm our ana-
    lytical framework in Winston I. Neither decision clarifies the
    "adjudicated on the merits" requirement of § 2254(d)(1) such
    that it compels disturbing our prior holding that the state-court
    denial of Winston’s habeas petition was not an adjudication
    on the merits. Remaining bound by that determination from
    Winston I, we reaffirm that § 2254(d) does not apply to Win-
    ston’s Atkins ineffectiveness claim and that de novo review of
    the claim is appropriate.
    Underpinning the Supreme Court’s discussion in Pinholster
    is the terse acknowledgment that the habeas petitioner’s
    claims had been adjudicated on the merits in state-court pro-
    ceedings. Neither party in that case appeared to focus energy
    on questioning whether § 2254(d)’s adjudicated-on-the-merits
    requirement had been fulfilled. Echoing the parties and
    assuming the incandescence of the state-court decision’s sta-
    tus, the Court phrased its holding as applying only to claims
    that had been adjudicated on the merits in state court. Pinhol-
    18                    WINSTON v. PEARSON
    ster, 
    131 S. Ct. at 1398
     ("[R]eview under § 2254(d)(1) is lim-
    ited to the record that was before the state court that
    adjudicated the claim on the merits." (emphasis added)); id.
    at 1400 ("If a claim has been adjudicated on the merits by a
    state court, a federal habeas petitioner must overcome the lim-
    itation of § 2254(d)(1) on the record that was before that state
    court." (emphasis added)). Not only that, the Court made
    plain that its analysis and the strictures of § 2254(d) do not
    apply to claims that had not been adjudicated on the merits in
    state court. Id. at 1401 (rejecting argument that the majority’s
    holding rendered § 2254(e)(2) superfluous by reasoning that
    § 2254(d) will not apply when "federal habeas courts . . . con-
    sider new evidence when deciding claims that were not adju-
    dicated on the merits in state court").
    To the extent that Pinholster confronted the adjudication-
    on-the-merits requirement, interplay between the majority
    opinion and Justice Sotomayor’s dissent lends strength to our
    holding in Winston I. As we found in Winston I, Winston was
    hindered from producing critical evidence to buttress his
    Atkins ineffectiveness claim—such as the 66 IQ score—by the
    state court’s unreasonable denial of discovery and an evidenti-
    ary hearing. Like the hypothetical petitioner posited by Justice
    Sotomayor in Pinholster, Winston’s inability to produce
    potentially dispositive evidence in state habeas proceedings
    came about through no fault of his own. The Court’s tacit
    acknowledgment that the hypothetical petitioner would be
    free to present new, material evidence—because his claim had
    not been adjudicated on the merits in state court—thus lends
    at least some support to our holding in Winston I.
    In any event, we need not discern in Pinholster an enthusi-
    astic endorsement of Winston I. Quite the opposite, to disrupt
    our earlier adjudication we are required to conclude that Pin-
    holster "‘made a contrary decision of law applicable to the
    issue,’" TFWS, Inc., 
    572 F.3d at 191
     (quoting Aramony, 
    166 F.3d at 661
    ). This we cannot do. Our holding in Winston I
    was premised on the Supreme Court of Virginia’s failure to
    WINSTON v. PEARSON                     19
    adjudicate Winston’s Atkins ineffectiveness claim on the mer-
    its. Absent an adjudication on the merits, we determined that
    § 2254(d) deference was not owed to the state-court decision.
    Pinholster would thus impeach Winston I only if it rejected
    our conclusion that the Supreme Court of Virginia’s decision
    was not an adjudication on the merits. We are not persuaded
    that it did. The Court’s opinion contains almost no discussion
    of the parameters of the adjudication-on-the-merits require-
    ment, beyond its cursory assumption that the state-court deci-
    sions at issue satisfied the mandate of § 2254(d). Far from
    announcing a new rule to govern resolution of whether a
    claim was adjudicated on the merits in state court, the Court
    expressly declined to "decide where to draw the line between
    new claims and claims adjudicated on the merits," id. at 1401
    n.10. At bottom, nothing in Pinholster indicates that the
    Court’s disposition casts doubt on—much less overrules—our
    discussion of the adjudicated-on-the-merits requirement in
    Winston I.
    Nor does Richter demand that we reconsider our holding in
    Winston I. The Court there simply presumed that, absent "any
    indication or state-law procedural principles to the contrary,"
    a summary decision from a state habeas court constitutes an
    adjudication on the merits. Richter, 131 S. Ct. at 784–85.
    Richter’s reasoning is inapposite here, where Winston does
    not contest the thoroughness of the state-court decision but
    rather the court’s unreasonable denial of his requests for dis-
    covery and an evidentiary hearing. We found in Winston I that
    the state court’s refusal to allow Winston to develop the
    record, combined with the material nature of the evidence that
    would have been produced in state court were appropriate
    procedures followed, rendered its decision unbefitting of clas-
    sification as an adjudication on the merits. Richter mentions
    nothing of possible defects in a state-court decision save the
    summary nature of its disposition, and we accordingly con-
    clude that it does not affect our analysis in Winston I.
    20                    WINSTON v. PEARSON
    To forestall the conclusion that Winston I remains valid, the
    Commonwealth emphasizes Justice Sotomayor’s citation of
    the decision in her dissent. Justice Sotomayor cited Winston
    I to support the proposition that "[s]ome courts have held that
    when a federal court admits new evidence supporting a claim
    adjudicated on the merits in state court, § 2254(d)(1) does not
    apply at all and the federal court may review the claim de
    novo," an approach that she claimed the majority rejected.
    Pinholster, 
    131 S. Ct. at 1417
     (Sotomayor, J., dissenting). The
    Commonwealth maintains that this language necessarily
    means that the majority overruled Winston I.
    But the Commonwealth’s reliance on Justice Sotomayor’s
    dissent is misplaced. First, as a dissenter, Justice Sotomayor’s
    views on the ramifications of the majority opinion are not suf-
    ficient, without more, to compel us to reject the law of the
    case. Second, we respectfully disagree with Justice Sotomay-
    or’s view of Winston I. We did not hold that any time a fed-
    eral habeas court "admits new evidence supporting a claim
    adjudicated on the merits in state court, § 2254(d)(1) does not
    apply at all," id. (emphasis added). We reasoned, rather, that
    § 2254(d)(1) does not apply to Winston’s case, as his Atkins
    ineffectiveness claim was not adjudicated on the merits in
    state court. This principle in fact finds support in Justice Soto-
    mayor’s dissent, which acknowledges, "Of course,
    § 2254(d)(1) only applies when a state court has adjudicated
    a claim on the merits," id. at 1417 n.5. Indeed, Justice Soto-
    mayor "assume[d] that the majority does not intend to suggest
    that review is limited to the state-court record when a petition-
    er’s inability to develop the facts supporting his claim was the
    fault of the state court itself." Id. Such is the case here. Thus
    Justice Sotomayor’s dissent, if anything, endorses our holding
    in Winston I.
    That Winston I was not abrogated by intervening Supreme
    Court precedent also finds support in our recent decision in
    Richardson v. Branker, 
    668 F.3d 128
     (4th Cir. 2012). There,
    we cited with approval Winston I’s holding that the state-court
    WINSTON v. PEARSON                      21
    decision did not qualify as an adjudication on the merits
    because "Virginia state courts did not afford Winston an evi-
    dentiary hearing and thus passed on the opportunity to adjudi-
    cate his claim on a complete record." Richardson, 668 F.3d at
    152 n.26 (alteration and internal quotations omitted). Never-
    theless, we distinguished the petitioner’s case, in which the
    state court "held an evidentiary hearing and received evi-
    dence," from Winston I. Id. Nowhere did we express doubt
    about the continuing validity of Winston I in light of Pinhol-
    ster and Richter.
    C.
    Looking past the four corners of the Pinholster opinion, the
    Commonwealth points to two decisions that it asserts estab-
    lish that Winston I is no longer valid. We reject the Common-
    wealth’s interpretations of these cases and locate nothing in
    them that mandates rejecting our analysis in Winston I.
    The Commonwealth first contends that our decision in
    Jackson v. Kelly, 
    650 F.3d 477
     (4th Cir. 2011), implicitly
    determined that Pinholster had overruled Winston I. We dis-
    agree. In Jackson, we characterized Pinholster as instructing
    that, "when a habeas petitioner’s claim has been adjudicated
    on the merits in state court, a federal court is precluded from
    supplementing the record with facts adduced for the first time
    at a federal evidentiary hearing." 
    650 F.3d at 492
    . Although
    the district court had held an evidentiary hearing on the peti-
    tioner’s claim—noting generally that the claim had not been
    adequately developed in state court—we limited our review to
    the state-court record, concluding that the state court had
    adjudicated the claim on the merits. 
    Id. at 485
    .
    Nowhere in Jackson, however, did we illuminate the
    adjudicated-on-the-merits requirement. Rather, in Jackson we
    merely noted matter-of-factly that which did not seem to be
    in dispute—that the state court had adjudicated the claim on
    the merits. Here, in contrast, we are required to critically ana-
    22                        WINSTON v. PEARSON
    lyze the status of the state-court decision. In that regard, we
    must confront our own prior conclusion—which, as we have
    explained, we cannot casually overrule—that the Supreme
    Court of Virginia expressly did not adjudicate Winston’s
    Atkins ineffectiveness claim on the merits. This important dis-
    tinction, viewed in tandem with the limited discussion of the
    adjudication-on-the-merits requirement in Jackson, convinces
    us that the decisions are not incongruous.
    Next, the Commonwealth directs our attention to Atkins v.
    Clarke, 
    642 F.3d 47
     (1st Cir. 2011), which it asserts recog-
    nizes that Pinholster overruled Winston I. A closer review of
    Clarke reveals that the Commonwealth’s interpretation is
    erroneous. The petitioner in Clarke contended that his claims
    had not been adjudicated on the merits in state court, and he
    relied in part on Winston I in framing the argument. The First
    Circuit initially noted unremarkably, "To the extent [Winston
    I is] inconsistent with [Pinholster] . . . , [it is], of course, over-
    ruled." Clarke, 642 F.3d at 49. Because there was "no doubt
    that this case was adjudicated on the merits," the First Circuit
    found the petitioner’s reliance on Winston I misplaced. Id.
    The court did not, as the Commonwealth intimates, suggest
    that our analysis of § 2254(d) in Winston I had been assailed
    by Pinholster. It instead distinguished the case before it from
    Winston I, noting that extending the rule in Winston I to cover
    the petitioner’s case—in which all material facts had been
    presented to the state court—would contravene Pinholster.
    Nothing in the opinion detracts from our holding in Winston
    I.5
    5
    The Commonwealth cites a bevy of other circuit decisions issued after
    Pinholster that reviewed state-court habeas dismissals under § 2254(d).
    But none of the cases present the factors that we found crucial to our hold-
    ing in Winston I, and the courts in these cases cursorily assumed that the
    claims had been adjudicated on the merits in state court. The decisions are
    therefore of little aid to our task.
    WINSTON v. PEARSON                      23
    IV.
    After reaffirming that § 2254(d) does not apply to Win-
    ston’s Atkins ineffectiveness claim, which the state court
    failed to adjudicate on the merits, we proceed to review de
    novo Winston’s claim and the district court’s decision to grant
    habeas relief, Richardson, 668 F.3d at 138.
    Winston contends that his trial attorneys were ineffective
    for failing to argue to the jury during sentencing that Winston
    is mentally retarded. Had the court concluded that he was
    mentally retarded, Atkins would have barred imposition of a
    death sentence as contrary to the Eighth Amendment’s prohi-
    bition on cruel and unusual punishments. Virginia law pro-
    vides that an individual is mentally retarded—and hence
    ineligible for a death sentence—if he establishes a disability
    originating before eighteen years of age characterized by "sig-
    nificantly subaverage intellectual functioning as demonstrated
    by performance on a standardized measure of intellectual
    functioning" and "significant limitations in adaptive behav-
    ior." 
    Va. Code Ann. § 19.2-264.3
    :1.1(A). To meet the first
    prong of the formulation, a petitioner must show an IQ score
    of 70 or less. Hedrick v. True, 
    443 F.3d 342
    , 367 (4th Cir.
    2006).
    Reviewing the claim de novo, we conclude that Winston is
    entitled to habeas relief. As we explain below, Winston has
    demonstrated both deficient performance by his attorneys and
    prejudice, as required under Supreme Court precedent. Had
    Winston’s trial attorneys presented evidence of his mental
    retardation at sentencing, there is a reasonable probability that
    the court would not have sentenced him to death. We accord-
    ingly affirm the district court’s grant of habeas relief.
    A.
    The familiar Strickland formulation governs our ineffec-
    tiveness inquiry. To succeed on a claim of ineffective assis-
    24                     WINSTON v. PEARSON
    tance of counsel, a petitioner must demonstrate deficient
    performance and prejudice. Richter, 
    131 S. Ct. at 787
    . Review
    of counsel’s actions is hallmarked by deference, and we are
    mindful that "[i]t is ‘all too tempting’ to ‘second-guess coun-
    sel’s assistance after conviction or adverse sentence.’" 
    Id. at 788
     (quoting Strickland, 
    466 U.S. at 689
    ). We are not at lib-
    erty to rely on hindsight to reconstruct the circumstances of
    counsel’s conduct, "indulg[ing] ‘post hoc rationalization’ for
    counsel’s decisionmaking that contradicts the available evi-
    dence of counsel’s actions." 
    Id. at 790
     (quoting Wiggins v.
    Smith, 
    539 U.S. 510
    , 526 (2003)).
    Demonstrating deficient performance requires showing that
    "‘counsel’s representation fell below an objective standard of
    reasonableness.’" Id. at 787 (quoting Strickland, 
    466 U.S. at 688
    ). A reviewing court conducting the deficient-performance
    inquiry "must apply a ‘strong presumption’ that counsel’s rep-
    resentation was within the ‘wide range’ of reasonable profes-
    sional assistance." 
    Id.
     (quoting Strickland, 
    466 U.S. at 689
    ).
    The critical question is "whether an attorney’s representation
    amounted to incompetence under ‘prevailing professional
    norms,’ not whether it deviated from best practices or most
    common custom." 
    Id. at 788
     (quoting Strickland, 
    466 U.S. at 690
    ).
    Yet deference to the decisions of counsel is not limitless.
    Attorneys have a duty to investigate their client’s case so as
    to enable them to make professional decisions that merit dis-
    tinction as "informed legal choices." See Elmore v. Ozmint,
    
    661 F.3d 783
    , 858 (4th Cir. 2011). Genuinely evaluating tacti-
    cal options is a necessity, and "[c]ounsel’s lack of preparation
    and research cannot be considered the result of deliberate,
    informed trial strategy." Hyman v. Aiken, 
    824 F.2d 1405
    ,
    1416 (4th Cir. 1987). The strong presumption that counsel’s
    choices were part of an overarching strategy "does not over-
    come the failure of . . . attorneys . . . to be familiar with read-
    ily available documents necessary to an understanding of their
    client’s case." 
    Id.
    WINSTON v. PEARSON                     25
    Once a petitioner has established deficient performance, he
    must prove prejudice—"‘a reasonable probability that, but for
    counsel’s unprofessional errors, the result of the proceeding
    would have been different.’" Richter, 
    131 S. Ct. at 787
     (quot-
    ing Strickland, 
    466 U.S. at 694
    ). "‘A reasonable probability
    is a probability sufficient to undermine confidence in the out-
    come.’" 
    Id.
     (quoting Strickland, 
    466 U.S. at 694
    ). Pointing to
    some "‘conceivable effect on the outcome of the proceeding’"
    is insufficient to satisfy Strickland’s demanding test. 
    Id. at 788
     (quoting Strickland, 
    466 U.S. at 693
    ). "The likelihood of
    a different result must be substantial, not just conceivable."
    
    Id. at 792
    .
    B.
    Applying the Strickland formulation to the actions of Win-
    ston’s attorneys during sentencing, we hold that they rendered
    deficient performance that prejudiced Winston.
    As to the first prong of the standard, the failure of Win-
    ston’s attorneys to review his school records and interview
    school officials about his mental functioning amounts to defi-
    cient performance. Counsel were obligated "to be familiar
    with readily available documents necessary to an understand-
    ing of [Winston’s] case," Hyman, 
    824 F.2d at 1416
    . By
    neglecting to review Winston’s school records and instead
    relying on Nelson to ascertain their import, counsel abdicated
    their responsibility. As the attorneys admitted, reading the
    documents would have raised the potential for a successful
    claim that Atkins barred imposition of a death sentence on
    Winston. This would have prompted them to interview Win-
    ston’s school teachers and counselors, facilitating an investi-
    gation that carried dual significance under Virginia’s mental-
    retardation statute. Not only would interviews with school
    officials have enabled counsel to obtain from Lageman Win-
    ston’s 66 IQ score, these conversations would have provided
    counsel with compelling evidence of Winston’s limitations in
    adaptive behavior, which in turn would have prompted them
    26                    WINSTON v. PEARSON
    to press Nelson to explore further the merits of mental retar-
    dation as a sentencing defense.
    Counsel’s lack of diligence in pursuing a mental-
    retardation defense contravened their duty to investigate to
    make defensible professional decisions qualifying as "in-
    formed legal choices." See Elmore, 
    661 F.3d at 858
    . Contrary
    to the Commonwealth’s suggestions, the presumption that the
    attorneys’ omissions were part of trial strategy "does not over-
    come [their] failure . . . to be familiar with readily available
    documents," Hyman, 
    824 F.2d at 1416
    . As in Hyman, coun-
    sel’s "lack of preparation and research cannot be considered
    the result of deliberate, informed trial strategy," 
    id.
    Having shown deficient performance, Winston has also
    demonstrated "‘a reasonable probability that, but for counsel’s
    unprofessional errors, the result of the proceeding would have
    been different,’" Richter, 
    131 S. Ct. at 787
     (quoting Strick-
    land, 
    466 U.S. at 694
    ). Establishing a successful Atkins
    defense to a death sentence requires presenting proof of an IQ
    of 70 or below, Hedrick, 
    443 F.3d at 367
    , and "significant
    limitations in adaptive behavior," 
    Va. Code Ann. § 19.2
    -
    264.3:1.1(A). As to the first prong, had counsel reviewed the
    school records and found the Reclassification, they testified
    that they would have interviewed Lageman and searched for
    a potential below-70 IQ score. And Lageman, as she testified,
    would have given Winston’s attorneys the report of Winston’s
    66 IQ score. Investigation by counsel would have similarly
    uncovered evidence of significant limitations in Winston’s
    adaptive behavior. Through interviews of school officials and
    review of school records, counsel could have presented evi-
    dence at sentencing demonstrating that Winston met the sec-
    ond prong of the mental-retardation test.
    Nelson’s testimony at the federal evidentiary hearing fur-
    ther bolsters our conclusion that Winston has shown preju-
    dice. Nelson, the court-appointed mental-health expert,
    conceded that he could not remember reading the Reclassifi-
    WINSTON v. PEARSON                     27
    cation. Nor was he presented with the 66 IQ score or informa-
    tion from school officials and counselors. A close review of
    such documents, according to Nelson, would have been
    important to his analysis, including his conclusions about
    Winston’s adaptive functioning. "It’s certainly possible," tes-
    tified Nelson, "my opinion might have been different with this
    wealth of other information." J.A. 720.
    Considering the question anew, we therefore agree with the
    district court that, "had counsel read the overlooked records,
    followed up, raised the issue, and marshaled the evidence" of
    mental retardation, Winston, 
    784 F. Supp. 2d at 634
    , there is
    a reasonable probability that the outcome of the proceeding
    would have been different. Accordingly, Winston is entitled
    to habeas relief.
    The Commonwealth attempts to resist this result by refer-
    encing the district court’s alleged disregard of
    § 2254(e)(1)and our decision in Green v. Johnson, 
    515 F.3d 290
     (4th Cir. 2008). Its contentions are unavailing.
    Turning first to the import of § 2254(e)(1), because the
    Supreme Court of Virginia refused discovery and an evidenti-
    ary hearing—and the evidence that would have been gleaned
    from these vehicles is critical to Winston’s claim—its deci-
    sion includes few factual findings to which we must defer
    under § 2254(e)(1). The district court properly credited the
    state court’s findings that Winston had scored 77, 76, and 73
    on three IQ tests and that Winston could have been classified
    by the school system as mentally retarded without scoring 70
    or below on an IQ test. But it correctly found that the new evi-
    dence produced by Winston—pursuant to which the state
    court made no factual findings—compelled granting him
    relief. Section 2254(e)(1) obviously presupposes that the state
    court made factual findings to which a federal habeas court
    might defer. Thus where the state court failed to adjudicate a
    claim on the merits by refusing to facilitate production of
    28                    WINSTON v. PEARSON
    new, material evidence, meaningful deference to its factual
    findings is well-nigh impossible.
    Similarly, the Commonwealth’s reliance on Green is unper-
    suasive. The Commonwealth maintains that Green stands for
    the proposition that federal courts are bound by a state court’s
    determination that presentation of a single below-70 IQ score,
    when accompanied by three above-70 scores, does not satisfy
    the statutory definition of subaverage intellectual functioning.
    The Commonwealth’s argument is misplaced, for two rea-
    sons. First, we reviewed the state-court decision in Green for
    objective unreasonableness under § 2254(d). 
    515 F.3d at 300
    .
    In contrast, we review Winston’s ineffectiveness claim de
    novo. Second, the state court in Green discredited the lone
    below-70 score, leaving it to consider three above-70 scores.
    
    Id.
     Here, however, the Supreme Court of Virginia did not
    impugn the validity of Winston’s 66 IQ score, as it did not
    even review it.
    To summarize, we agree with the district court that Win-
    ston has made a clear showing of prejudice flowing from his
    attorneys’ deficient performance. Presentation of the 66 IQ
    score, the Reclassification, and testimony from school offi-
    cials and counselors would have significantly strengthened
    Winston’s sentencing case such that we can confidently ascer-
    tain a "‘reasonable probability that, but for counsel’s unpro-
    fessional errors,’" Richter, 
    131 S. Ct. at 787
     (quoting
    Strickland, 
    466 U.S. at 694
    ), the court would not have sen-
    tenced Winston to death.
    V.
    In his cross-appeal, Winston asks us to revise the remedy
    ordered by the district court to reflect that he is entitled to a
    new full sentencing proceeding. We find modifying the relief
    ordered by the district court both unwarranted and unneces-
    sary in light of our understanding of the district court’s state-
    ment of remedy.
    WINSTON v. PEARSON                     29
    The district court had no authority to fashion a particular
    procedure to remedy the Atkins violation. See Henderson v.
    Frank, 
    155 F.3d 159
    , 168 (3d Cir. 1998) ("This is not a direct
    appeal from a federal conviction, where upon vacating the
    judgment this Court would have unlimited power to attach
    conditions to the criminal proceedings on remand. Rather, this
    is federal habeas corpus relating to a state conviction." (cita-
    tion omitted)). We therefore construe the district court’s
    directive to the Commonwealth to "conduct a trial on the
    question of whether Winston is mentally retarded, and sen-
    tence him accordingly," J.A. 635, as not restricting the range
    of remedies for the Atkins violation to a single-issue trial on
    mental retardation. Instead, that language must be understood
    to mean that, should the Commonwealth continue to seek the
    death penalty, Virginia law governs the question of whether
    our grant of the writ necessitates an entirely new sentencing
    phase or permits a narrow trial on the issue of mental retarda-
    tion. Having afforded Winston habeas relief, at this stage we
    leave it to the Commonwealth’s prerogative to craft a remedy
    consonant with the strictures of state law.
    Framing the district court’s order in its proper context
    moreover persuades us that the cross-appeal is likely moot.
    The Commonwealth has conceded in its supplemental brief-
    ing that, if Winston is entitled to relief, state law likely
    requires it to give Winston a full resentencing proceeding.
    This is all that Winston requests.
    VI.
    For the foregoing reasons, we affirm the district court’s
    grant of habeas relief.
    AFFIRMED