United States v. Charles Hall ( 2019 )


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  •                  United States Court of Appeals
    For the Eighth Circuit
    ___________________________
    No. 14-2742
    ___________________________
    United States of America
    Plaintiff - Appellee
    v.
    Charles Michael Hall
    Defendant - Appellant
    ____________
    Appeal from United States District Court
    for the Western District of Missouri - Springfield
    ____________
    Submitted: January 15, 2019
    Filed: December 19, 2019
    ____________
    Before LOKEN, GRASZ, and STRAS, Circuit Judges.
    ____________
    STRAS, Circuit Judge.
    Charles Hall and Wesley Coonce killed Victor Castro-Rodriguez after brutally
    beating him. A jury found Hall guilty of first-degree murder, see 
    18 U.S.C. § 1111
    (b), and following the presentation of a number of aggravating and mitigating
    factors, returned a death sentence. Hall appeals only his sentence and challenges,
    among other issues, the aggravating and mitigating factors the jury considered, the
    evidence it heard, and the instructions it received. We affirm.
    I.
    The three men were serving federal sentences in a mental-health ward at a
    medical center for federal prisoners in Springfield, Missouri, when Hall and Coonce
    attacked Castro-Rodriguez. As Hall admitted, they had discussed the crime two or
    three days in advance. Hall has said that killing calms him and that if Castro-
    Rodriguez had not been available, he “would have randomly selected another
    inmate” to kill instead.
    According to the testimony of one inmate, Hall lured Castro-Rodriguez by
    promising him money if he would pretend to be a hostage. Hall allegedly told him
    that if he would go along, prison officials might agree to give them additional
    privileges, including cable television, in exchange for his release. After Castro-
    Rodriguez agreed, Hall and Coonce followed him into his cell, where they made him
    lie on his back, bound his hands and feet, stuffed a rag in his mouth, and blindfolded
    him. Once he could no longer move or call for help, Coonce repeatedly kicked him
    and stomped on his neck. Hall then stood on his throat. After several minutes, Hall
    stepped off, checked for a pulse, and punched his stomach “to see if he would react.”
    An autopsy revealed that Castro-Rodriguez died from suffocation caused by
    compression of his larynx, although he also had internal bleeding, scrapes, and
    bruises from the repeated blows to his head, neck, and chest.
    Hall and Coonce were tried together. The jury found them both guilty after
    deliberating for less than three hours. At a joint sentencing hearing, the jury heard
    evidence about various aggravating and mitigating factors. After deliberating
    again—this time into a second day—the jury unanimously recommended a death
    -2-
    sentence for both of them. The district court 1 accepted the jury’s recommendation
    and entered judgment.
    II.
    The first question is whether the district court abused its discretion by trying
    Hall and Coonce together. See United States v. Ortiz, 
    315 F.3d 873
    , 898 (8th Cir.
    2002). Both initially objected to a joint trial, but after the jury found them guilty,
    Hall withdrew his objection to a joint sentencing hearing. His position now is that
    the refusal to sever the proceedings at the guilt phase allowed the jury to hear
    evidence that unfairly prejudiced him during the penalty phase.
    A joint trial is “often preferable when the joined defendants’ criminal conduct
    arises out of a single chain of events,” because it gives the jury a chance “to assign
    fairly the respective responsibilities of each defendant.” Kansas v. Carr, 
    136 S. Ct. 633
    , 645 (2016) (citation omitted). This case is a good example. Hall and Coonce
    agreed ahead of time to murder Castro-Rodriguez. Once they entered his cell
    together, Hall tied him up, Coonce took the lead in assaulting him, and then Hall
    dealt the fatal blow by standing on his throat. They acted side by side at every step,
    so it was logical for the district court to allow “their fates [to be] determined by a
    single jury.” 
    Id. at 646
    .
    To be sure, holding a joint trial resulted in the same jury hearing both
    Coonce’s guilt-phase defense that Hall was the driving force behind the crime and
    the government’s case for the death penalty. This made the proceeding unfair,
    according to Hall, because Coonce’s theory “logically supported” and supplemented
    the government’s penalty-phase argument that Hall would likely be violent in the
    future.
    1
    The Honorable Gary A. Fenner, United States District Judge for the Western
    District of Missouri.
    -3-
    Even if these arguments overlapped to some degree, Hall cannot establish that
    Coonce’s guilt-phase evidence “so infected the sentencing proceeding with
    unfairness as to render the jury’s imposition of the death penalty” unconstitutional.
    
    Id.
     at 644–45 (citation omitted). In arguing that he was less blameworthy than Hall,
    Coonce never suggested that Hall, as the alleged mastermind, would do something
    similarly violent in the future. Nor did the government connect those dots. Its theory
    was simpler: Hall was dangerous because he repeatedly said he would commit
    crimes and had a lengthy history of threatening violence. See infra Part IV.B
    (addressing the admissibility of the government’s evidence). For us to accept Hall’s
    theory that the joint trial unfairly prejudiced him would require “an exercise in
    speculation, rather than reasoned judgment.” Romano v. Oklahoma, 
    512 U.S. 1
    , 14
    (1994). And speculation is not enough. See Carr, 
    136 S. Ct. at 646
    .
    III.
    Hall’s next group of challenges focuses on the aggravating and mitigating
    factors presented to the jury. In determining whether a death sentence was
    “justif[ied],” the jury’s task during the penalty phase was to “consider” whether the
    aggravating factors “sufficiently outweigh[ed]” the mitigating factors. 
    18 U.S.C. § 3593
    (e); see also 
    id.
     § 3592 (identifying potential aggravating and mitigating
    factors).
    A.
    The federal death-penalty statute divides aggravating factors into two
    categories: the listed ones that the jury “shall” consider and those “other aggravating
    factor[s]” that it “may” consider. Id. § 3592(c). Despite this open-ended language,
    Hall claims that one unlisted factor, grave indifference to human life, should never
    -4-
    have been submitted to the jury. 2 He points out that the jury already considered his
    mental state once in determining that he was eligible for the death penalty, so doing
    it again improperly counted the same factor twice. The premise is correct, but his
    conclusion is not.
    Nothing in the federal death-penalty statute says that the jury can only
    consider a defendant’s mental state once. To the contrary, the statute contemplates
    the possibility that the jury will do so at least twice, first when determining whether
    the death penalty is on the table at all and again when evaluating the aggravating
    factors presented by the government. Compare id. § 3591(a)(2) (listing the various
    mental states giving rise to death-sentence eligibility), with id. § 3592(c)(5)
    (requiring a “grave risk of death”); id. § 3592(c)(6) (committing the offense in an
    “especially heinous, cruel, or depraved manner”); id. § 3592(c)(9) (demonstrating
    “substantial planning and premeditation”); id. § 3592(c)(16) (having the intent to kill
    or attempting “to kill more than one person in a single criminal episode”). And some
    of the factors even seem to overlap with one another, further weakening Hall’s
    double-counting theory. See, e.g., id. § 3592(a)(1) (acting with a “significantly
    impaired” capacity to “appreciate the wrongfulness” of the conduct); id.
    § 3592(a)(6) (carrying out the offense “under severe mental or emotional
    disturbance”). Hall’s argument, in other words, is contrary to the statute, which
    constructs a two-stage process with overlapping inquiries, see id. §§ 3591(a)(2),
    3592(a), (c), and is inclusive when it comes to the factors that a jury may consider,
    see id. § 3592(c).
    2
    Hall also argues that future dangerousness should not have been submitted as
    an aggravating factor because a prediction about events yet to occur cannot be
    proved beyond a reasonable doubt. See 
    18 U.S.C. § 3593
    (c) (requiring the
    government to prove the “existence of any aggravating factor” beyond a reasonable
    doubt). We recently considered and rejected this argument, see United States v.
    Coonce, 
    932 F.3d 623
    , 642–43 (8th Cir. 2019), and do so here too.
    -5-
    B.
    Hall challenges another aggravating factor for a different reason. He argues
    that the government did not provide enough evidence for the jury to find that he
    killed Castro-Rodriguez in an especially heinous, cruel, or depraved manner. See 
    id.
    § 3592(c)(6).
    In explaining this factor, the district court told the jury that the killing was
    heinous if it was “extremely wicked or shockingly evil”; it was cruel if Hall
    “intended to inflict a high degree of pain”; and it was depraved if Hall “relished the
    killing or showed indifference to [Castro-Rodriguez’s] suffering.” The government
    also had to show “serious physical abuse,” which the instructions defined as “a
    significant or considerable amount of injury or damage to [Castro-Rodriguez’s]
    body.” See 
    18 U.S.C. § 3592
    (c)(6) (requiring “torture” or “serious physical abuse”);
    see also United States v. Montgomery, 
    635 F.3d 1074
    , 1095–96 (8th Cir. 2011)
    (defining “serious physical abuse” to include “inflict[ing] suffering . . . above and
    beyond that necessary to cause death” (internal quotation marks and citation
    omitted)).
    Contrary to Hall’s suggestion, the government’s evidence was sufficient to
    find that the killing was heinous, cruel, or depraved, and that it involved the infliction
    of serious physical abuse. The primary source of the government’s evidence was
    Hall’s initial statement to investigators shortly after the murder. In it, he recounted
    how he had bound Castro-Rodriguez’s hands and feet, stuffed a rag in his mouth,
    blindfolded him, watched Coonce assault him, and then stood on his throat until he
    stopped breathing. He also acknowledged the senselessness of the crime, explaining
    that if Castro-Rodriguez had not been available, he “would have randomly selected
    another inmate and killed him” instead. The medical examiner, after describing the
    injuries and confirming that they were consistent with Hall’s account, estimated that
    it likely took “more than three minutes, maybe [even] five minutes” for Castro-
    -6-
    Rodriguez to die and that it was possible that he remained conscious nearly the entire
    time.
    From this evidence, a reasonable juror could conclude that Hall intended to
    “inflict a high degree of pain” and was “indifferen[t] to [Castro-Rodriguez’s]
    suffering.” The fact that Castro-Rodriguez had been tricked and rendered helpless
    only increased his distress, and the prolonged beating inflicted gratuitous pain. And
    even as the assault was coming to a close, Hall extended Castro-Rodriguez’s
    suffering by suffocating him slowly, even as he likely remained conscious.
    It is true, as Hall argues, that other death-penalty cases have involved greater
    cruelty and more extreme violence. See, e.g., 
    id.
     at 1079–80. But those cases do not
    set the floor, and the fact that some murders are even more heinous, cruel, or
    depraved does not mean that this one was not.
    C.
    Turning to the mitigating factors, the district court allowed the jury to
    consider, as relevant here, Hall’s good behavior in prison after the murder and his
    difficulties with a chronic gastrointestinal disease, neither of which was disputed
    factually. Even so, some jurors found that the factors did not “exist[],” which Hall
    attributes to a failure to follow the court’s instructions to make factual findings on
    each of the mitigating factors first, before deciding whether to assign them weight.
    We agree that the most likely explanation is that some jurors misunderstood
    the instructions on the the verdict form. The form required the foreperson to record
    “the number of jurors who . . . found the existence of [each] mitigating factor to be
    proven by a preponderance of the evidence,” yet she wrote “6” in the space for Hall’s
    medical condition and “0” in the other. Following their discharge, some jurors
    informed the district court that the foreperson may have recorded the number who
    voted to give these factors mitigating weight, rather than the number who found that
    -7-
    they “had been proved.” See Fed. R. Evid. 606(b)(2)(C) (providing an exception for
    juror testimony when it involves “a mistake . . . in entering the verdict on the verdict
    form”). Given that the government did not dispute either factor, however, there was
    no reason for the foreperson to write anything other than “12” for both.
    Unlike Hall, however, we are convinced beyond a reasonable doubt that any
    mistake the jury may have made was harmless. See 
    18 U.S.C. § 3595
    (c)(2). As a
    baseline principle, the jurors were not required to give any mitigating weight to
    Hall’s post-murder good behavior or his medical condition, see United States v.
    Paul, 
    217 F.3d 989
    , 999 (8th Cir. 2000), even if he had a right to present them to the
    jury. Only if the jurors assigned no weight to them because they believed, “as a
    matter of law,” that they were “unable even to consider the evidence” would a
    constitutional problem arise. Eddings v. Oklahoma, 
    455 U.S. 104
    , 113 (1982).
    Nothing in the record suggests that this was the case. To the contrary, the fact
    that six jurors assigned some weight to Hall’s medical condition suggests that they
    understood that it was their call to make. See Paul, 
    217 F.3d at 1000
     (explaining
    that the test is whether “there exists a reasonable likelihood that the jurors believed
    themselves precluded from considering relevant mitigating evidence”). There is, in
    short, no reason to believe that marking the form with one piece of information rather
    than another affected the jury’s decision-making or changed its overall conclusion.
    IV.
    Hall also challenges several evidentiary rulings. Under the federal death-
    penalty statute, the standard for admission of evidence at penalty-phase proceedings
    is “relaxed”: parties may present ordinarily inadmissible evidence without worrying
    about the Federal Rules of Evidence. United States v. Purkey, 
    428 F.3d 738
    , 758
    (8th Cir. 2005); see 
    18 U.S.C. § 3593
    (c). The idea is that the more information the
    jury has when choosing between life and death, the better. See United States v. Lee,
    
    274 F.3d 485
    , 494 (8th Cir. 2001). Yet the statute also vests the district court with
    -8-
    broad discretion to exclude evidence if it is irrelevant or “its probative value is
    outweighed by the danger of creating unfair prejudice, confusing the issues, or
    misleading the jury.” 
    18 U.S.C. § 3593
    (c). Compare 
    id.
     (requiring only that the
    probative value be “outweighed” by the “danger[s]” created by the evidence), with
    Fed. R. Evid. 403 (adopting a similar standard, but requiring the probative value to
    be “substantially outweighed” by these risks (emphasis added)). The court has more
    gatekeeping power, in other words, even though a greater range of evidence can
    potentially pass through the door. See Purkey, 
    428 F.3d at 756
    .
    A.
    The first evidentiary ruling that we have been asked to review was the decision
    to limit the scope of Dr. Park Dietz’s cross-examination. The government called
    him to rebut the opinions of several mental-health experts who testified that Hall’s
    bipolar disorder caused him to lose self-control. While explaining his qualifications,
    Dr. Dietz stated that he had been asked to testify in over one thousand cases,
    including some high-profile prosecutions. He admitted that in one of them, he had
    made false statements that eventually led to an overturned conviction. See Yates v.
    State, 
    171 S.W.3d 215
    , 221–22 (Tex. App. 2005).
    The district court allowed Hall’s attorney to thoroughly question Dr. Dietz
    about what happened in Yates. But it would not allow him to question Dr. Dietz
    about a judge’s refusal to appoint him as a court-appointed expert in another case,
    Gates v. Chappell, No. C 88-2779 WHA (N.D. Cal.). Because the judge in Gates
    had refused to appoint Dr. Dietz based solely on concerns about his impartiality after
    Yates, the court reasoned, there was little to be gained from the additional
    -9-
    questioning. In Hall’s view, cutting off this line of inquiry was an abuse of
    discretion. 3 See 
    18 U.S.C. § 3595
    (c)(2). We disagree.
    The additional questioning had low probative value even if it was arguably
    relevant. The first possibility was that it could have shed light on Dr. Dietz’s
    credibility. But the opinion of a single district judge on his fitness for a different
    type of role in an unrelated case only marginally assisted the jurors in answering the
    critical question they faced: should they believe his testimony?
    The second possibility was that it could have rebutted Dr. Dietz’s claim that
    he had testified in over one thousand cases. See 
    id.
     § 3593(c) (allowing both the
    government and the defendant to “rebut any information received at the hearing”).
    This is an impressive-sounding number, and as Hall points out, Gates was one case
    in which Dr. Dietz was not allowed to testify. Still, the evidence had limited
    probative value, especially after Dr. Dietz admitted that the figure was not as
    impressive as it sounded. Earlier in his career, he explained, he worked in a hospital
    and participated in about a dozen commitment hearings per week. More recently,
    by contrast, he had not appeared in court nearly as often.
    Not only was the probative value low, it carried a high risk of confusing or
    misleading the jury. It is unlikely that the jurors could have understood the
    differences between the roles of a court-appointed expert and a government witness,
    at least without additional factual development. In fact, some may well have
    concluded that a federal judge’s decision not to appoint Dr. Dietz superseded their
    own opinions about his testimony, no matter what he said about Hall. Cf. Rosales-
    3
    Hall also claims that the decision violated his rights under the Confrontation
    Clause of the Sixth Amendment. As we recently explained, however, the
    Confrontation Clause does not apply to sentencing proceedings, even those
    involving a potential death sentence. See Coonce, 932 F.3d at 640–41; see also
    Williams v. New York, 
    337 U.S. 241
    , 251–52 (1949).
    -10-
    Lopez v. United States, 
    451 U.S. 182
    , 188 (1981) (stating that jurors “must reach
    conclusions as to impartiality and credibility by relying on their own evaluations of
    demeanor evidence and of responses to questions”). Given these risks, we cannot
    say that the court abused its discretion in cutting off this line of questioning. See 
    id.
    B.
    Another contested evidentiary ruling was allowing the government to prove
    Hall’s future dangerousness through, among other things, evidence of threats Hall
    had made against various officials, his pre-murder misbehavior in prison, and his
    numerous prior crimes. According to Hall, this evidence was minimally probative
    and highly prejudicial and never should have been admitted.
    During the penalty-phase proceedings, the jury heard that Hall had threatened
    to kill a federal judge and prosecutors; to bomb various sensitive locations, including
    an airport and President George H.W. Bush’s home; and to orchestrate a mass
    poisoning. This evidence was presented along with various statements that he had
    made to psychiatrists, psychologists, nurses, and other staff about wanting to harm
    or kill people in prison. As the government pointed out, he even acted on those
    desires once before murdering Castro-Rodriguez, when he assaulted another inmate.
    Although the victim suffered only minor injuries, Hall later stated in a letter to a
    psychiatrist that his intent “wasn’t . . . just to punch him. . . . [It] was to choke him
    to death.” The letter went on to say that if he “was on the open unit today, [killing
    someone] would” have been his “intent and goal.”
    The jury also heard that Hall had difficulty following the rules, both inside
    and outside of prison. The government introduced evidence that he had been
    convicted of a number of crimes over a 25-year period, including burglary, forgery,
    theft, false public alarm, receiving stolen goods, and assault. His behavior was
    problematic in prison too, where he fought, gambled, and possessed contraband prior
    to the murder.
    -11-
    All of this evidence was relevant. See 
    18 U.S.C. § 3593
    (c). A reasonable
    juror could view Hall’s threats as reflecting a propensity for violence. It is true, of
    course, that Hall could have been bluffing, as he now claims, knowing full well that
    he could not possibly carry out some of his threats. But that was a credibility
    determination for the jury to make. See id.; see also Lee, 
    274 F.3d at 494
     (discussing
    the “very low barriers to the admission of evidence”).
    To be sure, the evidence was of mixed value. For example, Hall’s decades-
    old convictions, some for nonviolent crimes, arguably shed less light on his future
    dangerousness. But collectively, the evidence tended to show that Hall wanted to
    hurt others and might do so if given an opportunity, regardless of where he was or
    what constraints were placed on him.
    On the other side of the scale, the evidence was only prejudicial in the sense
    that it made it hard for Hall to argue that he was not dangerous. But there was
    nothing unfair about its admission. Cf. United States v. Looking Cloud, 
    419 F.3d 781
    , 785 (8th Cir. 2005) (“Evidence is not unfairly prejudicial because it tends to
    prove guilt, but because it tends to encourage the jury to find guilt from improper
    reasoning.”). It did not cause confusion or lead the jury to consider a factor it should
    not have in making its sentencing recommendation. Without showing that one of
    those things may have occurred, Hall has given us little reason to question the district
    court’s discretionary decision to admit it. See Lee, 
    274 F.3d at 494
     (“[D]etermining
    whether there is a threat of unfair prejudice [under 
    18 U.S.C. § 3593
    (c)] is a fact
    specific inquiry . . . .”).
    C.
    Hall also questions the district court’s decision to allow the government to
    introduce two letters that he sent to the prosecutor before trial. In the first, he
    expressed his desire to be executed and offered to “enter a ple[a] of guilty” if the
    -12-
    prosecutor “could guarantee” that he received a death sentence. He also explained
    that “[t]he only thing that [would] stop [him] from killing again [was] to put [him]
    to death.” In the second, which was delivered both to the prosecutor and to his own
    attorney, he explained in detail why he thought he was eligible for the death penalty,
    directed his attorney to work toward a death sentence, and requested a guilty plea
    “as long as” the prosecutor would recommend one. The government did not respond
    to either letter.
    The district court admitted both letters during the guilt phase of Hall’s trial,
    but they played a significant role at sentencing too. See 
    18 U.S.C. § 3593
    (c)
    (allowing the jury to consider information from the guilt phase when evaluating
    aggravating and mitigating factors). Because Hall is appealing only his sentence,
    however, we review their admissibility under the “more lenient” evidentiary
    standard applicable at the penalty phase, Purkey, 
    428 F.3d at 756
    , leaving aside
    whether the jury should have seen them earlier when it was evaluating Hall’s guilt.
    Coonce, 932 F.3d at 637.
    Under this standard, the district court did not abuse its discretion when it
    admitted the letters. They contained expressions of guilt and threats to kill again,
    both of which were highly probative of several aggravating factors, including his
    future dangerousness, lack of remorse, and indifference to human life.
    It does not matter that admitting the letters left him with an uphill battle during
    the penalty-phase proceedings, because there was nothing unfair about their
    admission, even if, as Hall claims, his “notions about the case changed dramatically
    after [he] benefitted from different legal advice offered by new counsel.” Cf.
    Looking Cloud, 
    419 F.3d at 785
     (explaining that “unfair prejudice” refers to
    encouraging “the jury to find guilt from improper reasoning”). Just because he
    changed his mind does not mean that it was unfair to use his earlier admissions
    -13-
    against him. 4 Cf. United States v. Muhlenbruch, 
    634 F.3d 987
    , 1001 (8th Cir. 2011)
    (holding that a district court did not abuse its discretion under Rule 403 when it
    permitted the government to play a defendant’s videotaped confession).
    His argument to the contrary is really just an attempt to import Federal Rule
    of Evidence 410(a)(4)—which prohibits using statements made during plea
    negotiations against a defendant at trial—into penalty-phase proceedings. But this
    theory gets him nowhere because, according to the federal death-penalty statute,
    “[i]nformation is admissible” at the sentencing hearing “regardless of its
    admissibility under the rules governing admission of evidence at criminal trials.”
    
    18 U.S.C. § 3593
    (c). So it makes no difference whether, as Hall insists, the
    statements would otherwise count as having been “made during plea negotiations.”
    They were admissible either way.
    D.
    The final evidentiary issue was the exclusion of Hall’s “comparative
    proportionality” evidence, which summarized the aggravating and mitigating
    circumstances in other death-penalty cases. Hall’s theory was that the jury might be
    less likely to think that he deserved the death penalty if it could evaluate how he
    compared to others who committed similar crimes. The evidence consisted of short
    4
    Hall vaguely asserts that allowing the jury to see that he had previously asked
    for the death penalty was unfairly prejudicial. But this is a different argument than
    he raised before the district court or in his briefs, which took the position that the
    letters were completely inadmissible because they contained statements made during
    plea negotiations. See Fed. R. Evid. 410(a)(4). In any event, Hall never sought a
    limiting instruction or argued that the court should have redacted the letters, so we
    can hardly fault it for failing to take one of these actions on its own. Cf. United
    States v. Melton, 
    870 F.3d 830
    , 837–38 (8th Cir. 2017) (holding that admitting a
    document containing potentially prejudicial statements was not an abuse of
    discretion because, although the defendant requested a limiting instruction, he “did
    not pursue the government’s offer to redact” them).
    -14-
    summaries of sixteen cases—all involving murders committed in federal prison—
    along with a list of the aggravating and mitigating factors in each case. Also
    included were three spreadsheets that repackaged this information in various ways.
    As the district court recognized, the evidence had limited probative value. The
    most obvious shortcoming was that no one had any way of knowing whether the
    selected cases were representative. According to Hall’s attorney, they shared three
    characteristics: each went to trial, a death sentence was on the table, and information
    was available from public sources or the attorneys who tried them. This approach
    made sense from a practical, information-gathering perspective, but relevant
    information could have been missing for a variety of reasons. Indeed, Hall has
    trimmed his list down even more on appeal. The explanation, according to his brief,
    is that “the detailed facts . . . necessary for a proper comparative analysis could not
    be assembled” for five of his original sixteen cases. It is unclear what, if anything,
    changed, but this development highlights the problems posed by the evidence.
    The presentation of the cases posed other potential problems. The nuances
    were arguably lost in the long lists of aggravating and mitigating factors that he
    provided. For example, two cases might involve the same future-dangerousness
    aggravating factor, but a jury might find a death sentence appropriate in one case
    and not the other, leaving the jurors in this case to wonder why. Compare United
    States v. Houston, 
    648 F.3d 806
    , 811–12 (9th Cir. 2011) (involving a life sentence
    for a racially-motivated-stabbing death), with United States v. Snarr, 
    704 F.3d 368
    ,
    377 (5th Cir. 2013) (imposing a death sentence for a stabbing attack that killed a
    fellow inmate and left two prison guards wounded). Admitting the evidence could
    have opened the door to a debate about whether Hall’s lists and spreadsheets
    adequately captured their details, not to mention whether they were similar enough
    to Hall’s case. If so, the potential for confusion and distraction was clear.
    Another more serious risk was also looming. Using lists and spreadsheets
    potentially invited the jurors to view their assignment in Hall’s case in similar terms:
    -15-
    simply tally up the aggravating and mitigating factors and see where he fell on the
    list, rather than undertake an “individualized determination” based on the facts and
    circumstances of his case. Tuilaepa v. California, 
    512 U.S. 967
    , 972 (1994) (citation
    omitted); see Purkey, 
    428 F.3d at 762
     (explaining that the federal death-penalty
    statute “avoids arbitrary death sentences by requiring juries to weigh [the]
    aggravating and mitigating factors rather than [just] tally the factors on each side and
    declare a winner based on sheer numbers”).
    It is possible, of course, that the district court could have found a way to
    manage these difficulties. But this was a discretionary call, and the court was
    entitled to conclude that admitting the evidence would have caused more trouble
    than it was worth. 5 See 
    18 U.S.C. § 3593
    (c) (giving the district court broad authority
    as gatekeeper).
    V.
    Hall’s remaining challenge is to the district court’s response to two notes from
    the jury foreperson during penalty-phase deliberations. One of them stated that the
    jury could not reach a unanimous decision on Hall’s sentence, but the court directed
    the jury to keep trying. Hall’s position is that it felt pressured after that point to
    recommend a death sentence.
    In evaluating Hall’s argument, context matters. See United States v. Walrath,
    
    324 F.3d 966
    , 970 (8th Cir. 2003) (listing factors that help identify impermissible
    jury coercion). The jury began its deliberations on Friday afternoon, had the
    weekend off, and then resumed on Monday morning. Shortly after lunch, the
    foreperson sent a note asking if “the lawyers have the option to poll the jury if [it]
    5
    In light of this conclusion, we leave for another day the broader question of
    whether comparative-proportionality evidence is ever admissible as a mitigating
    factor. See 
    18 U.S.C. § 3592
    (a) (providing a nonexclusive list of mitigating factors).
    -16-
    can’t reach a unanimous decision[?]” The court replied that the jury “w[ould] not
    be polled if a nonunanimous verdict [was] accepted.” The foreperson then sent a
    second note, this time announcing that the jury had reached a decision on Coonce,
    but “with 100% certainty” could not reach one on Hall. Hall’s attorney urged the
    court to declare that the jury was “hung,” which would have resulted in a life
    sentence. See Jones v. United States, 
    527 U.S. 373
    , 380–81 (1999). Instead, the
    court told the jury to “continue [its] deliberations, and [to] try to reach unanimous
    verdicts.” After deliberating for approximately another hour, the jury returned a
    recommendation of death.
    The district court was faced with a choice: declare the jury deadlocked or
    direct it to continue its deliberations. Given that the jury had been deliberating for
    less than one full day, it sent the jury back so that it could keep trying. See United
    States v. Hagan, 
    412 F.3d 887
    , 890 (8th Cir. 2005) (reviewing a coercive-instruction
    claim for an abuse of discretion). In making this decision, the court did not have to
    automatically acquiesce in the jury’s assessment. Lowenfield v. Phelps, 
    484 U.S. 231
    , 238 (1988). Rather, as the Supreme Court has recognized, courts
    “incontestably” have the “authority to insist that [jurors] deliberate further,” at least
    under certain circumstances. 
    Id.
    This is one of those circumstances. The jury had previously been instructed
    that its task was to choose between life in prison and a death sentence. Telling the
    jurors to deliberate further in an effort to reach unanimity did not “coerce” them into
    picking one alternative over the other. Nor did the court tell the jurors to reconsider
    their positions or that they must be unanimous in the end, which are the types of
    statements that have necessitated prophylactic instructions in the past. See United
    States v. Robinson, 
    953 F.2d 433
    , 437 (8th Cir. 1992). Here, the court was simply
    exercising its judgment that it was sensible under the circumstances to ask the jury
    to deliberate longer before giving up. Lowenfield, 
    484 U.S. at 238
    ; see also United
    States v. Reed, 
    686 F.2d 651
    , 652 n.1 (8th Cir. 1982) (“A supplemental instruction
    merely to continue deliberating after impasse . . . is not properly characterized as a
    -17-
    traditional Allen charge.” (citing Allen v. United States, 
    164 U.S. 492
    , 501–02
    (1896))).
    The jury’s response showed that it did not feel pressured to choose either
    alternative. Although it continued to deliberate for only about an hour more, the jury
    requested three exhibits connected to the lack-of-remorse and future-dangerousness
    aggravating factors. Cf. United States v. Warfield, 
    97 F.3d 1014
    , 1022 (8th Cir.
    1996) (“Although the jury’s return with a verdict approximately one hour after
    receiving the Allen charge is somewhat expeditious, we do not believe the
    postinstruction deliberation time . . . raises an inference of coercion.”). This timeline
    suggests that the jurors continued to debate whether the death penalty was justified;
    discussed and reexamined the evidence that they found most compelling; and
    eventually agreed on a recommendation. If they felt no choice but to impose the
    death penalty, as Hall now claims, there would have been little reason to request the
    exhibits. The bottom line is that nothing here raises a red flag that there may have
    been coercion.
    The design of the verdict form does not change our conclusion. Hall argues
    that by instructing the jurors to “proceed to” consideration of a life sentence if it
    could not unanimously agree on a death sentence, the district court should have
    known that the second note reported that the jury had effectively ruled out death.6
    There are two flaws in this argument. First, the second note said only that the jury
    6
    It is true that at some point the foreperson marked “NO” in the space for
    recommending a death sentence, before scratching it out and marking “YES”
    instead. But we have no way of knowing when it happened or why. Cf. Blueford v.
    Arkansas, 
    566 U.S. 599
    , 607 (2012) (explaining that until deliberations are over and
    the jury announces its final decision, jurors are free to “rethink” their votes). Neither
    did the district court, because even if the foreperson marked “NO” before sending
    the second note, the court never saw the partially completed form. So this possibility
    cannot have a bearing on our assessment of its decision to send the jury back for
    further deliberations.
    -18-
    was not unanimous, not that death was off the table. Second, the argument ignores
    the fact that the jury had a binary choice to make: life in prison or a death sentence.
    Nothing prevented the jury from moving back and forth between these two
    alternatives, and the second note simply reflected the fact that, up to that point, there
    was a lack of agreement on which of the two to choose. Under these circumstances,
    it was reasonable for the court to conclude that the jury was not trying to return a
    final verdict and that further deliberations would eventually allow it to do so.
    VI.
    Finally, we note that Hall has raised three issues for potential en banc or
    Supreme Court review: it was unconstitutional to use future dangerousness as an
    aggravating factor, the district court misstated the law when it instructed the jury
    that Hall “must be sentenced to death” if it made certain findings, and it was
    unconstitutional to treat his lack of remorse as both proof of future dangerousness
    and as a standalone aggravating factor. Controlling precedent squarely forecloses
    Hall’s positions on these three issues.7 See Barefoot v. Estelle, 
    463 U.S. 880
    , 896
    (1983) (future dangerousness); Montgomery, 
    635 F.3d at 1099
     (the jury instruction);
    Purkey, 
    428 F.3d at 762
     (overlapping aggravating factors).
    VII.
    We accordingly affirm the judgment of the district court.
    ______________________________
    7
    Moreover, to the extent that Hall argues that he is entitled to a new trial
    because of cumulative error, this argument fails on its own terms. See supra Part
    III.C (identifying as the only potential error that the jury may have misunderstood
    one part of the verdict form); see also United States v. Darden, 
    70 F.3d 1507
    , 1549
    (8th Cir. 1995) (rejecting a cumulative-error argument because the court had only
    identified one error).
    -19-