Parker, McCray, and Fortson v. United States ( 2021 )


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    DISTRICT OF COLUMBIA COURT OF APPEALS
    Nos. 17-CO-755, 17-CO-870, & 17-CO-1024
    TIMOTHY PARKER, MARCELLUS MCCRAY, AND ANTONIO FORTSON,
    APPELLANTS,
    V.
    UNITED STATES, APPELLEE.
    Appeals from the Superior Court
    of the District of Columbia
    (CF2-12342-10, CF1-4749-11, CF1-4729-11)
    (Hon. Henry F. Greene, Trial Judge)
    (Argued January 13, 2021 *                                Decided July 22, 2021)
    Peter H. Meyers for appellant Parker.
    David H. Reiter for appellant McCray.
    William R. Cowden for appellant Fortson.
    *
    This court originally heard argument in these appeals on October 23, 2018,
    when the division consisted of Chief Judge Blackburne-Rigsby, Associate Judge
    Glickman, and Senior Judge Pryor. After that argument, (1) Judge Pryor recused
    himself and Judge Ruiz was appointed to replace him on the division; and (2)
    appellants supplemented their appeals to add arguments based on the subsequent
    rehearing petitions, briefing, and decision in Fleming v. United States, 
    224 A.3d 213
    (D.C. 2020) (en banc). In light of the change in the composition of the division and
    the expansion of appellants’ claims, this court called for reargument in these appeals,
    which was held on January 13, 2021.
    2
    David P. Saybolt, Assistant United States Attorney, with whom Jesse K. Liu,
    United States Attorney, Michael R. Sherwin, Acting United States Attorney, and
    Elizabeth Trosman, Suzanne Grealy Curt, Laura Bach, and Silvia Gonzalez Roman,
    Assistant United States Attorneys, were on the briefs, for appellee.
    Before BLACKBURNE-RIGSBY, Chief Judge, GLICKMAN, Associate Judge, and
    RUIZ, Senior Judge.
    GLICKMAN, Associate Judge: After a trial in 2012, a jury convicted appellants
    Timothy Parker, Marcellus McCray, and Antonio Fortson of voluntary manslaughter
    while armed and other felony offenses.1 In their direct appeals, this court rejected
    most of appellants’ claims of error and remanded their cases to the trial court for
    further proceedings and rulings on two issues. These concerned (1) whether the
    government suppressed favorable evidence in violation of its obligations under
    Brady v. Maryland,2 and (2) whether the trial court precluded appellants from
    establishing that a government witness suffered from a mental disability that
    seriously diminished his credibility. The present appeals are from the trial court’s
    rulings against appellants on each of those issues on remand. In addition, for the
    1
    See McCray v. United States (“McCray I”), 
    133 A.3d 205
     (D.C. 2016). The
    indictments charged appellants with participating in a series of “shootings, assaults,
    and murders that occurred in the Benning Terrace Housing complex in the Southeast
    quadrant of the District of Columbia from 2009 to 2011.” 
    Id. at 210
    . The jury found
    appellants guilty of voluntary manslaughter while armed as a lesser-included offense
    of the charge of second-degree murder while armed.
    2
    
    373 U.S. 83
     (1963).
    3
    first time in these appeals, appellants contend that their manslaughter convictions
    must be vacated because the trial court gave the jury the “urban gun battle”
    instruction that this court subsequently held erroneous in Fleming v. United States.3
    We conclude that appellants’ Fleming challenge to their convictions is not
    properly before us at this time, because appellants have not shown exceptional
    circumstances excusing their failure to raise that challenge in their direct appeals.
    Accordingly, appellants first must bring their Fleming claims in Superior Court via
    a collateral challenge to their convictions pursuant to 
    D.C. Code § 23-110
    . We
    affirm the trial court’s rulings on remand regarding the other issues.
    I.
    In Fleming, this court sitting en banc considered a challenge to the causation
    instruction regarding a defendant’s potential liability for a homicide committed in
    an “urban gun battle.” The instruction informed the jury that:
    [A] defendant should be deemed to have caused [the
    victim’s] death if (1) the defendant was armed and
    prepared to engage in a gun battle; (2) the defendant in fact
    engaged in a gun battle; (3) the defendant's conduct was a
    substantial factor in the death of [the victim]; (4) it was
    3
    
    224 A.3d 213
     (D.C. 2020) (en banc).
    4
    reasonably foreseeable that death or serious bodily injury
    could occur as a result of the defendant’s conduct during
    the gun battle; and (5) the defendant did not act in self-
    defense. 4
    This court had explicitly approved this causation instruction in Roy v. United States.5
    But sitting en banc in Fleming, we overruled Roy and held this instruction inadequate
    because it did not convey to the jury that a defendant normally “cannot be held to
    have personally caused a death unless an action by the defendant is a but-for cause
    of the death, i.e., unless it is true that in the absence of the defendant’s action the
    death would not have occurred.”6 Requiring the defendant’s conduct merely to have
    4
    
    Id. at 219
     (emphasis added).
    5
    
    871 A.2d 498
    , 506–08 & n.8 (D.C. 2005). In doing so, the Roy court
    explained that
    In this jurisdiction we have held findings of homicide
    liability permissible where: (1) a defendant’s actions
    contribute substantially to or are a substantial factor in a
    fatal injury; and (2) the death is a reasonable foreseeable
    consequence of the defendant's actions. We have defined
    substantial cause as that conduct which a reasonable
    person would regard as having produced the fatal
    effect. Thus, we hold defendants criminally accountable
    for, “all harms that are reasonably foreseeable
    consequences of his or her actions.”
    
    Id.
     at 507–08 (citations and footnote omitted).
    6
    
    Id.
     at 217 (citing Burrage v. United States, 
    571 U.S. 204
     (2014)).
    5
    been “a substantial factor” in the victim’s death “is not remotely equivalent,” we
    said, to the requirement of but-for causation. 7
    The jury at appellants’ trial received the causation instruction subsequently
    held defective in Fleming. Appellants now argue that the instructional error requires
    that their manslaughter convictions be vacated. In opposition, the government
    argues that this claim of error at trial is not properly before us, because appellants
    did not present it on direct appeal of their convictions in McCray I and cannot
    demonstrate exceptional circumstances excusing that failure. 8 We agree with the
    government.
    “It is a general principle of appellate practice that ‘where an argument could
    have been raised on an initial appeal, it is inappropriate to consider the argument on
    a second appeal following remand.’” 9 Failure to make the argument in the initial
    7
    
    Id. at 223
    .
    8
    Appellants base their Fleming instructional challenge to their convictions
    on the record of the trial, not on anything in the proceedings on remand. They do
    not claim that the instructional error at their trial somehow infected the proceedings
    on remand from which the instant appeals were taken. Appellants did not challenge
    the urban gun battle instruction in the proceedings on remand, and the trial court had
    no occasion to rule or rely on it.
    9
    Thoubboron v. Ford Motor Co., 
    809 A.2d 1204
    , 1215 (D.C. 2002) (citing
    Hartman v. Duffey, 
    88 F.3d 1232
    , 1236 (D.C. Cir. 1996)). This principle applies to
    criminal as well as to civil appeals. See United States v. Henry, 
    472 F.3d 910
    , 913
    6
    appeal amounts to a waiver. This “rule serves judicial economy by forcing parties
    to raise issues whose resolution might spare the court and parties later rounds of
    remands and appeals.” 10 An appellate court does have discretion to “waive the
    waiver” and excuse a returning appellant’s failure to have raised a claim in an initial
    appeal, but courts normally exercise this discretion “only in exceptional
    circumstances, where injustice might otherwise result.”11
    Appellants argue that they objected to the urban gun battle instruction in their
    direct appeals, and that they are renewing those objections in what is now merely a
    continuation of those direct appeals. Both parts of this argument are inaccurate.
    In their initial appeals of their convictions, appellants did not object to the
    instruction on the Fleming ground that it misstated the causation requirement.
    (D.C. Cir. 2007) (“It is well-settled that ‘where an argument could have been raised
    on an initial appeal, it is inappropriate to consider that argument on a second appeal
    following remand.’”) (quoting Nw. Ind. Tel. Co. v. FCC, 
    872 F.2d 465
    , 470 (D.C.
    Cir. 1989)); see also, e.g., United States v. Flores, 
    995 F.3d 214
    , 223 (D.C. Cir.
    2021).
    10
    Hartman, 
    88 F.3d at
    1236 (citing Crocker v. Piedmont Aviation, Inc., 
    49 F.3d 735
    , 740 (D.C. Cir. 1995)).
    11
    Henry, 
    472 F.3d at 913
     (cleaned up; quoting Crocker, 
    49 F.3d at
    739 and
    Eli Lilly & Co. v. Home Ins. Co., 
    794 F.2d 710
    , 717 (D.C. Cir. 1986)); see also
    Flores, 995 F.3d at 226.
    7
    Rather, appellants mainly argued that it was error to give the urban gun battle
    instruction in combination with an instruction on aiding and abetting, and that the
    instructions “constituted an improper constructive amendment” of the indictment.12
    McCray I rejected those entirely different contentions. And while Mr. Fortson
    complained in his brief on direct appeal that the urban gun battle instruction allowed
    the jury to convict him without finding he had fired the fatal shot, that was a
    complaint about the main effect and purpose of the instruction, not an argument for
    its invalidity. This objection too was substantively different from an argument that
    the instruction improperly dispensed with the requirement of but-for causation in
    favor of a substantial factor test. In fact, Fleming confirms that a defendant who did
    not fire the fatal bullet may be convicted as a but-for cause of the victim’s death if
    his actions instigated the shooting, by another, that led to the victim’s death.13
    12
    McCray I, 
    133 A.3d at 226
    .
    13
    See Fleming, 224 A.3d at 217 (“[A] defendant cannot be held to have
    personally caused a death unless an action by the defendant is a but-for cause of the
    death[.]”); id. at 226 (“To illustrate the point concretely, we hold that a defendant
    can be viewed as having personally caused death if (1) the defendant, acting with an
    intent to kill, shoots at another person or takes other actions such as bringing an
    armed group in search of another person or brandishing a gun at another person[;]
    (2) the defendant’s acts foreseeably cause the intended target or another person to
    fire shots in response; and (3) the latter shots fatally wound a victim.”).
    8
    Appellants also are mistaken in arguing that McCray I’s remand to the trial
    court did not end their direct appeals, and that their current appeals from the trial
    court’s rulings on remand should be viewed as a continuation of their direct appeals.
    As this court explained in Bell v. United States,14 there are two types of remand. On
    “a record remand, this court retains jurisdiction over the case . . . [but] the record is
    returned to the trial court . . . to make additional findings, to hear further testimony,
    or to explain a ruling. The record is then returned to this court for decision.”15 In
    contrast, a case remand “returns the case to the trial court for all purposes. This court
    retains no jurisdiction over the case and the [first] appeal is terminated.”16
    McCray I expressly ordered a “case” remand, not a record remand. 17 Our
    opinion did not direct that the record be returned to us after the proceedings on
    remand; it specified that, after holding a hearing, the trial court itself should “enter
    an order” determining the outstanding “mental disabilities issue” and whether that
    issue entitled appellants to a new trial. 18 It follows that we are dealing now with “a
    14
    
    676 A.2d 37
     (D.C. 1996).
    15
    
    Id. at 41
    .
    16
    
    Id.
    17
    
    133 A.3d at 240
    .
    18
    
    Id.
     Our opinion did not address the Brady issue because, we explained,
    “that issue [was] still pending in the Superior Court” and appellants had “asked that
    9
    new appeal, separate from the [direct] appeal that was terminated when the case was
    remanded.”19
    That McCray I ordered a case remand also explains why this case is not in the
    same posture as Fleming when the en banc court decided it could hear a challenge
    to the urban gun battle instruction that had not been presented in the initial appeal
    heard by a division of the court. When the en banc court considered the claim in
    Fleming, there had been no intervening case remand; the case still was on direct
    appeal in this court.
    In sum, the present appeals are not a continuation of appellants’ initial direct
    appeals in this court. McCray I terminated appellants’ direct appeals. The Superior
    Court proceedings on remand resolved a collateral attack by appellants on their
    convictions. Appellants were, of course, allowed to appeal the judge’s adverse
    rulings against them in those collateral proceedings (the rulings on their Brady and
    witness-confrontation claims, the only claims before the judge). But that did not
    entitle appellants to include in their appeal a separate claim (of instructional error at
    this court allow the trial court to address the Brady issue in the first instance.” 
    Id.
     at
    234 n.22.
    19
    Bell, 
    676 A.2d at 41
    .
    10
    trial), which they never presented on remand and on which the remand judge never
    ruled. This court repeatedly has held that, in an appeal from the denial of a collateral
    motion to set aside a criminal conviction, we will not consider claims the movant
    did not present in the proceedings below.20
    Thus, we must conclude that appellants waived their current claims of
    instructional error at their trial. The question is whether there are exceptional
    circumstances present here raising a concern that injustice might result if this court
    does not exercise its discretion to excuse the waiver. Courts have recognized that
    an intervening change in the law may constitute such an exceptional circumstance,
    depending on the nature and significance of the change. 21 This is a pertinent factor,
    because this court rendered its en banc opinion in Fleming in January 2020, well
    after it decided McCray I in 2016, and after the proceedings on remand from that
    case. While appellants could have urged this court to overrule Roy in their direct
    appeals (just as Mr. Fleming ultimately did), we would not say that appellants should
    20
    See Bradley v. United States, 
    881 A.2d 640
    , 646 n.5 (D.C. 2005) (citing
    Miller v. Avirom, 
    384 F.2d 319
    , 321–22 (D.C. 1967); Southall v. United States, 
    716 A.2d 183
    , 188 (D.C. 1998) (citing D.D. v. M.T., 
    550 A.2d 37
    , 48 (D.C. 1988) and
    Veney v. United States, 
    681 A.2d 428
    , 435 n.10 (D.C. 1996) (en banc)).
    21
    See Flores, 995 F.3d at 226; Henry 
    472 F.3d at 914
    .
    11
    have anticipated the holding of Fleming and done so.22 Nevertheless, we conclude
    that waiving appellants’ waiver is unwarranted in this case, for three reasons.
    First, appellants have not argued that Fleming created an exceptional
    circumstance excusing their failure to challenge the urban gun battle instruction on
    causation grounds in their direct appeals.         Indeed, despite the fact that the
    government challenged appellants to show exceptional circumstances sufficient to
    overcome the waiver and allow them to pursue their Fleming argument in these post-
    remand appeals, appellants have not attempted to do so. Instead, in response to the
    government’s invocation of waiver, appellants have advanced only the arguments
    22
    See Fleming, 224 A.3d at 219 (“A division of the court cannot overrule a
    prior decision of the court. M.A.P. v. Ryan, 
    285 A.2d 310
    , 312 (D.C. 1971). It is
    difficult to see why a litigant should be required to present an argument to a division
    of the court that the division of the court would be required to reject. . . . The United
    States cites no case holding that a litigant is required to present to a division of the
    court the argument that a prior holding of the court should be overruled, and we are
    aware of no such case.”). The United States argues that appellants should have
    anticipated Fleming and raised a Fleming challenge to the urban gun battle
    instruction in their direct appeals because Fleming “was presaged by” the Supreme
    Court’s 2014 decision in Burrage v. United States, 
    571 U.S. 204
     (2014). But
    although the Fleming court found Burrage’s discussion of the usual requirement of
    but-for causation in criminal cases to be “persuasive” with respect to the causation
    issues before it, see 224 A.3d at 221, Burrage did not preordain the outcome in
    Fleming. In Burrage, the Supreme Court construed the phrase “results from” in the
    federal Controlled Substances Act; it did not have occasion to address causation
    under the (arguably atypical) urban gun battle theory of homicide liability and the
    differently worded murder statute in the District of Columbia.
    12
    we rejected above — that they did object to the urban gun battle instruction in their
    direct appeals, and that the present appeals are continuations of their direct appeals.
    As a general matter, this court will not substitute its own reasoning on a point that a
    party has failed to address.23
    Second, it is difficult to see why not exercising our discretion would work an
    injustice in this case, as appellants have not even tried to show any likelihood that a
    jury instruction comporting with Fleming would have resulted in their acquittals of
    manslaughter or otherwise altered the outcome of their trial in their favor. Instead,
    appellants have insisted the burden is on the government to show that the
    instructional error was harmless beyond a reasonable doubt. This contention does
    not withstand scrutiny, and not only because it mistakenly presupposes these appeals
    to be continuations of the direct appeals rather than collateral challenges. As we
    discuss below, a defendant must make a showing of prejudice to raise a new claim
    in a collateral challenge to a conviction after a direct appeal has concluded. But the
    government would not have borne the burden of showing harmlessness in this case
    even if appellants were making a Fleming claim of instructional error in their direct
    23
    See Comford v. United States, 
    947 A.2d 1181
    , 1188 (D.C. 2008) (Court of
    Appeals does not “do counsel’s work, create the ossature for the argument, and put
    flesh on its bones.”) (quoting United States v. Zannino, 
    895 F.2d 1
    , 17 (1st Cir. 1990)
    (citations omitted)).
    13
    appeals — had they done so, the claim would be subject to the strictures of plain
    error review on account of appellants’ failure to raise it at trial. Under plain error
    review, the government does not have the burden to disprove prejudice. Rather, it
    is on appellants to show prejudice affecting their substantial rights, i.e., in cases like
    this, a reasonable probability of a more favorable outcome if the jury had been
    instructed properly. 24 As appellants have not made, or even attempted to make, such
    a showing, they have not shown that waiving their waiver is necessary to avoid their
    suffering an injustice. The error in the urban gun battle instruction given at
    appellants’ trial might have been innocuous, and if so, there is no injustice in
    sustaining their convictions.
    The D.C. Circuit’s recent decision in United States v. Flores is instructive
    here.25 Mr. Flores was a member of a hit squad that attacked two ICE special agents
    in Mexico City, killing one and seriously wounding the other.26 After Mr. Flores
    entered a guilty plea to reduced charges that included accessory to murder and
    24
    See, e.g., Perry v. United States, 
    36 A.3d 799
    , 818 (D.C. 2011) (explaining
    that where a party did not object to a jury instruction at trial, “it is appellants’ burden
    to show a ‘reasonable probability’ of a different outcome if the jury had been
    properly instructed.”).
    25
    
    995 F.3d 214
     (D.C. Cir. 2021).
    26
    
    Id. at 218
    .
    14
    attempted murder in violation of 
    18 U.S.C. § 1114
    , the federal district court of the
    District of Columbia sentenced him to twelve years’ imprisonment. 27 He took a
    direct appeal, arguing the district court had erred in calculating his Sentencing
    Guidelines range.28 The D.C. Circuit agreed and remanded for resentencing.29 On
    remand, the district court again imposed a twelve-year sentence, and Mr. Flores took
    a second appeal.30 In it, he argued for the first time that his convictions for being an
    accessory to murder and attempted murder had to be vacated under the Circuit’s
    intervening decision, in United States v. Garcia Sota, 31 that § 1114 does not apply
    extraterritorially. The government countered that Mr. Flores had forfeited this
    argument by failing to raise it in his initial appeal. 32
    Acknowledging the “general” rule that “an appellant who fails to raise an
    available issue in an initial appeal may not raise that claim in a second appeal after
    27
    Id. at 219.
    28
    Id.
    29
    Id.; see United States v. Flores, 
    912 F.3d 613
    , 622 (D.C. Cir. 2019).
    30
    Flores, 995 F.3d at 219.
    31
    
    948 F.3d 356
     (D.C. Cir. 2020). The D.C. Circuit issued this decision after
    the district court resentenced Mr. Flores. See Flores, 995 F.3d at 226.
    32
    Flores, 995 F.3d at 223.
    15
    remand because such claims are forfeited,” 33 the D.C. Circuit (with one judge
    dissenting) nonetheless granted Mr. Flores the vacatur he sought. The majority
    opinion perceived Garcia Sota to be “an intervening change in the law,” making it
    “now plain that courts in this circuit lack the power to convict and punish [Mr.]
    Flores under Section 1114 for extraterritorial conduct.”34         This constituted an
    exceptional circumstance justifying the court’s discretionary consideration of an
    issue that Mr. Flores could have raised in his initial appeal, the court reasoned,
    because “injustice might otherwise result if [Mr.] Flores continues to be punished
    for conduct that does not constitute a crime pursuant to the law under which he was
    convicted.” 35
    But that is not this case. Fleming did not confirm that the Superior Court
    “lack[ed] the power to punish and convict” appellants for manslaughter, or that the
    evidence at their trial was insufficient as a matter of law to support their convictions.
    Fleming simply held that one of the instructions given at appellants’ trial was
    erroneous. Without having some sense of whether and how the instructional error
    33
    Id.
    34
    Id. at 226.
    35
    Id. (cleaned up).
    16
    might have prejudiced appellants — who were acquitted of murder but found guilty
    of manslaughter as a lesser-included offense after a lengthy proceeding involving
    over 60 witnesses and 500 exhibits36 — we cannot say appellants have demonstrated
    that we should address their claim to prevent an injustice.
    Third, appellants are not without a potential remedy if this court declines to
    address their Fleming claim in the present appeals from the decision of the Superior
    Court on remand. Appellants may pursue their Fleming claim in Superior Court via
    the established route of collateral attacks on their convictions pursuant to 
    D.C. Code § 23-110
    . To be sure, if they do so, appellants may have to surmount procedural
    barriers by showing cause for their failure to raise the claim previously (during the
    pendency of their direct appeals or in the post-remand proceedings) and prejudice as
    a result of that failure. 37 But appellants would have faced those same procedural
    36
    McCray I, 
    676 A.2d at 220
    .
    37
    See, e.g., 
    D.C. Code § 23-110
    (e) (2012 Repl.) (“The court shall not be
    required to entertain a second or successive motion for similar relief on behalf of the
    same prisoner.”); Washington v. United States, 
    834 A.2d 899
    , 902 (D.C. 2003)
    (“Where a defendant has failed to raise an available challenge to his conviction on
    direct appeal, he may not raise that issue on collateral attack unless he shows both
    cause for his failure to do so and prejudice as a result of his failure.”) (citing Head
    v. United States, 
    489 A.2d 450
    , 451 (D.C. 1985)); id. at 906 (“[A] claim not raised
    in a previous collateral attack is procedurally defaulted.”). We express no view as
    to whether appellants can succeed in showing cause and prejudice.
    17
    barriers if they had raised the Fleming claim in the Superior Court proceedings on
    remand from McCray I; we see no reason they should be excused from doing so
    now.38 This is another reason appellants have not demonstrated the existence of an
    exceptional circumstance calling upon this court to address their untimely challenge
    in order to avoid injustice.
    For the foregoing reasons, we conclude that appellants’ Fleming challenges
    to their manslaughter convictions are not properly before us in these appeals, and we
    decline to address those challenges.
    II.
    Appellants contend that the trial court erred on remand in denying their post-
    trial Brady claim without an evidentiary hearing. The claim relates to an audio
    38
    In Flores, the D.C. Circuit rejected the government’s argument that Mr.
    Flores was required to bring his claim of error as a collateral attack on his conviction
    in the district court by motion pursuant to 
    28 U.S.C. § 2255
     (the federal law
    counterpart of 
    D.C. Code § 23-110
    ) rather than by his appeal from the resentencing
    on remand. See 995 F.3d at 226–27. This reflected the fact that Mr. Flores’s claim
    was one of error infecting the resentencing proceeding itself, which involved the re-
    imposition of a judgment of conviction that the district court had no authority to
    impose under the law in effect at the time of the resentencing. With respect to their
    Fleming claim, however, appellants do not claim any error in the Superior Court
    proceedings on remand from McCray I.
    18
    recording of a 911 call made by a government witness named Shunedia Rajah. Ms.
    Rajah testified at trial that she saw and heard appellant Parker shooting. In her 911
    call, however, when asked by the emergency dispatcher if she “s[aw] the person who
    was shooting[,]” Ms. Rajah responded that she did not. Although the government
    turned the recording of Ms. Rajah’s 911 call over to the defense prior to trial, as an
    attachment to an email to defense counsel, appellants did not make use of it to cross-
    examine her. They subsequently claimed that the government violated Brady by
    failing to disclose the 911 call in time for them to appreciate its significance and
    make use of it at trial.
    The parties addressed this claim in the proceedings below through written
    pleadings and oral argument. Ruling from the bench, the court stated it “d[id] n[o]t
    believe [an evidentiary] hearing [was] necessary . . . in view of the representations
    [it had] heard from counsel.” The court held there was no Brady violation, and that
    the claim “border[ed] on the frivolous,” given that the government concededly
    apprised appellants’ trial counsel of the 911 call twenty-nine days before Ms. Rajah
    testified, and that counsel never sought additional time to explore the matter.
    An evidentiary hearing on a Brady claim is not required when the defendant
    fails to proffer evidence that the government suppressed material, exculpatory
    19
    information in its possession. 39 We will uphold the trial court’s decision to deny a
    Brady motion without an evidentiary hearing where “under no circumstances could
    the petitioner establish facts warranting relief.”40 Claims that consist of “(1) vague
    and conclusory allegations, (2) palpably incredible claims, and (3) assertions that
    would not merit relief even if true” do not warrant a hearing. 41
    Here, the trial court did not err in deciding that appellants failed to proffer
    evidence sufficient to require an evidentiary hearing on their Brady claims. In their
    pleadings, appellants charged that the government had violated its Brady obligations
    by waiting until the eve of trial to send the 911 recording to defense counsel in a mix
    of “several additional emails.” 42 In oral argument before the trial court, however,
    appellants’ counsel reframed their objection. Counsel asserted that the disclosure
    was not untimely, but that it had occurred as part of a “document dump of hundreds
    39
    See Bellinger v. United States, 
    127 A.3d 505
    , 519 (D.C. 2015).
    40
    Pettaway v. United States, 
    390 A.2d 981
    , 983–84 (D.C. 1978) (internal
    citations and quotation marks omitted).
    41
    Ramsey v. United States, 
    569 A.2d 142
    , 147 (D.C. 1990).
    42
    Appellants also asserted that the audio of the call was difficult to understand
    without a transcript (which the government did not provide). But defense counsel
    never complained of this problem with the call at or during trial, and the claim is
    inconsistent with appellants’ claim that their counsel never located the tape during
    the course of trial.
    20
    of different materials,” rendering the email containing the 911 call a “needle in the
    haystack” that was too difficult for the defense attorneys to find in time to use.
    Specifically, defense counsel stated:
    [M]y argument is not, Your Honor, that they didn’t have
    enough time to deal with it, which is what some of the
    other cases have dealt with; that is, the government gives
    partial or limited disclosure too late for the defense to
    effectively use it, that is not the claim I’m making here.
    My claim is it’s a document dump, Your Honor. It’s a
    needle in the haystack that none of these four lawyers were
    able to discover that it even had been given to them.”
    Nothing in the record, however, supports the claim that the 911 call was a
    “needle” in a documentary “haystack” not provided until shortly before trial.
    Appellants proffered only that “several” messages arrived on the eve of trial. This
    hardly amounts to a document dump. The email with the 911 call was entitled
    “Audio File attached,” it contained only one attachment (the 911 recording), and it
    specifically stated “[a]ttached is an audio file of a 911 call made by witness Shunedia
    Rajah.”     This indicates that the 911 call, contrary to appellants’ unsupported
    assertion, was not buried in such a manner that appellants’ counsel could not have
    found it in the twenty-nine days preceding Ms. Rajah’s testimony. On these facts,
    the government did not suppress the 911 call or impair appellants’ ability to make
    use of it at trial.
    21
    Having failed to proffer facts warranting relief, appellants also failed to
    indicate to the trial court, either in pleadings or during oral argument, what purpose
    an evidentiary hearing would serve. At the oral argument on the motion before the
    trial court, appellants’ only reference to an evidentiary hearing was a statement by
    one of their counsel that the purpose of the argument was to determine “whether
    [they] should have a hearing on [the Brady claims].” Counsel did not mention an
    evidentiary hearing again, even when the judge gave him the opportunity to make
    further representations after he had concluded his remarks. The trial court had no
    reason to think an evidentiary hearing would serve any useful purpose.
    Thus, we hold that the trial court did not err in finding that appellants failed
    to proffer evidence sufficient to warrant a hearing on their Brady claim. 43
    43
    The government also has disputed the materiality of the 911 call, but we
    need not reach that issue here.
    22
    III.
    A.
    At trial, the government presented testimony from a witness named Curtis
    Faison. Mr. Faison originally was a co-defendant with appellants, before he entered
    a guilty plea and agreed to testify for the government.44 In reviewing Mr. Faison’s
    juvenile medical records (to which the defense had been given access), appellants’
    defense counsel learned he once had been diagnosed with bipolar disorder.45 On
    that basis, appellants requested that the trial court allow a defense expert to evaluate
    Mr. Faison “to determine the impact of mental illness on Mr. Faison’s credibility.” 46
    The trial court refused, concluding that an outdated medical report did not provide
    sufficient reason to delay the then ongoing trial proceedings.47 When appellants
    challenged this ruling on appeal, this court in McCray I reversed and remanded
    “solely to provide these appellants with an opportunity to show at a hearing and
    through expert opinion whether at the time of his trial testimony, Mr. Faison’s
    44
    McCray I, 133 A.3d. at 231.
    45
    
    Id. at 231
    .
    46
    
    Id.
    47
    
    Id.
    23
    mental disabilities seriously impacted his credibility.” 48 If the trial court found that
    to be so, we held, it would then need to “determine whether it can say with fair
    assurance that Mr. Faison’s testimony did not sway the outcome of the verdicts
    against [appellants].” 49
    On remand, appellants and the government relied on the written reports and
    testimony of expert witnesses who had examined Mr. Faison, reviewed his medical
    records, and come to conclusions about his mental health status at the time of trial.
    Although this court remanded on the understanding Mr. Faison might have been
    suffering from a bipolar disorder that impaired his testimony, neither expert witness
    found that to be the case.
    The government’s expert, Dr. Patterson, testified that Mr. Faison was not
    suffering from symptoms of bipolar disorder, clinical anxiety, or depression when
    he testified at trial. Dr. Patterson diagnosed Mr. Faison with Antisocial Personality
    Disorder (“ASPD”). He testified that ASPD is not equivalent to a mental illness or
    disability, and he did not believe it affected Mr. Faison’s credibility at trial, i.e., his
    ability or willingness to testify truthfully.
    48
    
    Id. at 240
    .
    49
    
    Id. at 234
    .
    24
    Appellants’ expert, Dr. Gupta, agreed with Dr. Patterson that Mr. Faison’s
    bipolar disorder was inactive at the time of trial; she opined, however, that Mr.
    Faison suffered from depression and anxiety that affected his trial testimony.
    Although she agreed with Mr. Faison’s ASPD diagnosis, Dr. Gupta did not base her
    opinion on that diagnosis or opine that it impaired Mr. Faison’s credibility.
    In its oral ruling, the trial court “credited and gave great weight to the reports
    and testimony of Dr. Patterson,” but did not credit Dr. Gupta’s opinion, finding it to
    be “conclusory” and not supported by “persuasive analysis.” The court concluded
    that Mr. Faison’s credibility was not seriously impaired by mental disability or
    mental illness. It therefore found it unnecessary to decide whether his testimony
    swayed the jury’s verdict.
    B.
    Where, as here, a trial judge “presided over [a] factfinding hearing and was
    able to observe and assess the demeanor of the witnesses,” we take care to avoid
    “usurp[ing] the prerogative of the judge, as the trier of fact, to determine credibility
    and weigh the evidence.” 50 We must uphold the trial court’s determination to credit
    50
    In re S.G., 
    581 A.2d 771
    , 775 (D.C. 1990).
    25
    Dr. Patterson, and the court’s consequent finding that Mr. Faison’s mental
    disabilities did not seriously affect his testimony at trial, unless those determinations
    are clearly erroneous or devoid of support in the evidence.51
    C.
    This court has emphasized that “[o]ne’s psychiatric history is an area of great
    personal privacy which can only be invaded in cross-examination when required in
    the interest of justice.” 52 Although expert evidence concerning a witness’s mental
    health history may be relevant to credibility under some circumstances, its “use . . .
    for impeachment is greatly disfavored and is allowed only where it is shown that the
    evidence casts substantial doubt on the witness’ capacity to comprehend and relate
    51
    See, e.g., Wilkins v. Ferguson, 
    928 A.2d 655
    , 666 (D.C. 2007).
    52
    Velasquez v. United States, 
    801 A.2d 72
    , 79 (D.C. 2002). See also Collins
    v. United States, 
    491 A.2d 480
    , 484 (D.C. 1985) (explaining that there is a
    presumption against ordering “psychiatric examination[s] of a witness to determine
    [their] competency or aid the jury’s assessment of credibility . . . [b]ecause such an
    examination has the potential to impinge upon a witness’ right to privacy and to
    harass a witness”) (emphasis added) (citing Rogers v. United States, 
    419 A.2d 977
    ,
    980 (D.C. 1980)); Hilton v. United States, 
    435 A.2d 383
    , 387 (D.C. 1981) (noting
    that the trial court, in deciding whether to “order a . . . psychiatric examination for
    the purpose of . . . aid[ing] the jury in its assessment of a witness’ credibility . . .
    must weigh the potential evidentiary advantage of the examination against the
    dangers of an unwarranted invasion of privacy[,] . . . the potential harassment
    resulting therefrom or the likelihood that the witness may be deterred from coming
    forward.”) (citing United States v. Benn, 
    476 F.2d 1127
     (1972)).
    26
    the truth of pertinent events.”53 Admitting such evidence when it has not been shown
    to have a serious impact on credibility is “manifestly unfair and unnecessarily
    demeaning of the witness,” and risks “introduc[ing] . . . a collateral issue which
    would confuse the jury . . . .” 54 We have approved the exclusion of expert testimony
    concerning a witness’s mental health that “would have been of only “marginal
    relevance” to the witness’s credibility. 55 McCray I thus properly framed the issue in
    terms of whether appellants could show that Mr. Faison’s mental disabilities
    “seriously impacted his credibility” 56 by casting substantial doubt on his “ability or
    willingness” to tell the truth. 57
    53
    Jackson v. United States, 
    940 A.2d 981
    , 995 (D.C. 2008). See also Bennett
    v. United States, 
    876 A.2d 623
    , 632–33 (D.C. 2005); Bryant v. United States, 
    859 A.2d 1093
    , 1102 (D.C. 2004) (declaring that the mere fact of testifying “did not
    make it open season on a witness’ entire mental history.”); Roy v. United States, 
    871 A.2d 498
    , 510 (D.C. 2005) (overturned on unrelated grounds by Fleming, 224 A.3d
    at 217).
    54
    Velasquez, 
    801 A.2d at 79
    .
    55
    
    Id.
     at 79–80; Bennett, 
    876 A.2d at 635
     (D.C. 2005).
    56
    
    133 A.3d at 240
     (emphasis added).
    57
    
    Id. at 233
     (quoting United States v. Baxter, 
    761 F.3d 17
    , 24 (D.C. Cir.
    2014)); see also Tyer v. United States, 
    912 A.2d 1150
    , 1156 (D.C. 2006) (citing
    United States v. Smith, 
    77 F.3d 511
    , 516 (D.C. Cir. 1996)).
    27
    We are not persuaded that the trial court clearly erred in finding that appellants
    did not make that showing. Appellants have not provided any reason to conclude
    that the trial court erred in crediting Dr. Patterson’s testimony over that of Dr. Gupta.
    We defer to that credibility determination.58 And Dr. Patterson’s hearing testimony
    plainly supported the trial court’s conclusion that Mr. Faison’s ASPD did not have
    a serious impact on his ability or willingness to testify truthfully.
    We express no opinion on whether an ASPD diagnosis can ever have a
    sufficiently serious impact on a witness’s credibility such that expert evidence on
    that witness’s mental condition would be admissible at trial. Dr. Patterson conceded
    that possibility. We hold only that the evidence in this case supports the trial court’s
    finding that ASPD did not have such an impact on Mr. Faison.
    58
    See Rock Creek Plaza-Woodner Ltd. Partnership v. District of Columbia,
    
    466 A.2d 857
    , 859 (D.C. 1983) (“In resolving factual issues presented by conflicting
    expert testimony, the trial court is in the best position to evaluate the experts'
    qualifications, demeanor, experience, reasoning, and testimony. . . . Thus, as a
    general proposition, when faced with conflicting expert testimony, the trial court
    may credit one expert over the other”). See also In re. T.W.M., 
    18 A.3d 815
    , 821
    (D.C. 2011) (per curiam) (“The trial court, when acting as fact-finder . . . is entitled
    to credit the testimony of one expert witness over that of another.”); Nest v. Totah
    Venture, LLC. V. Deutsch, 
    31 A.3d 1211
    , 1222 (D.C. 2011) (same).
    28
    IV.
    For the foregoing reasons, we affirm the judgment of the Superior Court.