Justice Blackmun concluded that the prosecutorial summation denied Darden a fair trial. The prosecutors repeatedly offered personal assurances of guilt, derided Darden as an animal who should be leashed, blamed the corrections department for releasing him on furlough, and vividly wished that he had been shot or killed. Those comments, he reasoned, were a sustained effort to inflame the jury and divert it from the only guilt-phase question: whether Darden committed the charged crimes.
In Justice Blackmun's view, the majority gave insufficient weight to professional norms governing prosecutors and relied too heavily on Donnelly v. DeChristoforo, a case involving brief and ambiguous remarks followed by a direct curative instruction. Darden's case instead involved focused, repeated, and unambiguous misconduct. General instructions that arguments were not evidence did not adequately cure the harm, particularly because the trial court overruled an objection to one of the prosecutors' most inflammatory remarks.
He rejected the majority's reliance on invited response. Defense counsel's limited references to the poor police investigation, the death penalty, the perpetrator as an animal, and the weakness of the evidence did not justify the prosecutors' broad attack on Darden's humanity or their personal invective. Nor did defense counsel's rebuttal establish that the jury was unaffected; the relevant question was whether the prosecutors' misconduct impaired the jury's ability to decide guilt fairly.
Justice Blackmun also disputed the majority's assessment that the evidence was overwhelming. The identifications had suggestive features, and the ballistics testimony established only that bullets could have been fired from the recovered gun rather than conclusively linking that gun to the crime or Darden. Because the case substantially depended on credibility choices between the identification witnesses and Darden, the improper argument could have affected the verdict.
He further concluded that Murphy's exclusion violated Witherspoon and Witt. The trial judge treated a juror as disqualified not only when personal opposition to death would prevent compliance with the law, but also when complying with the law would conflict with the juror's principles. That approach, Justice Blackmun argued, wrongly excluded jurors who opposed capital punishment but nonetheless could conscientiously follow their oaths.
Murphy never said that he could not follow the court's instructions. The judge asked only whether Murphy's beliefs were so strong that recommending death would violate his principles, not whether those beliefs would prevent or substantially impair his performance of duty. Since the State bore the burden of demonstrating disqualifying bias, and an improper exclusion of even one qualified juror invalidates a death sentence, Justice Blackmun would have vacated the sentence as well as reversed the conviction.