Mullaney v. Wilbur

1975-06-09

Headline: State law forcing defendants to prove heat-of-passion provocation is rejected; Court rules prosecution must prove absence of that passion beyond a reasonable doubt, changing who bears risk in murder trials.

Holding: The Court held that the Due Process Clause requires the prosecution to prove beyond a reasonable doubt the absence of heat of passion on sudden provocation when that issue is presented in a homicide trial.

Real World Impact:

Requires prosecutors to prove lack of provocation beyond a reasonable doubt.
Makes it harder for states to make defendants disprove provocation defenses.
Affects sentencing outcomes between murder and manslaughter convictions.

Topics: homicide law, burden of proof, provocation defenses, due process

Summary

Background

The dispute involved the State of Maine and a man convicted of murder after killing another person in a hotel room. The man told police he had attacked in a frenzy after an unwanted sexual advance. At trial the judge told the jury that malice would be presumed unless the defendant proved, by a preponderance of the evidence, that he acted in the heat of passion on sudden provocation, which would reduce the offense to manslaughter.

Reasoning

The Court considered whether that Maine rule fits the Due Process principle, announced in Winship, that the prosecution must prove beyond a reasonable doubt every fact that makes someone guilty of the crime charged. The Court accepted the Maine courts’ reading of state law but emphasized that the distinction between murder and manslaughter carries very different punishments and stigma. Because the penalty difference can be as large as life imprisonment versus a lesser sentence, the Court concluded the prosecution must prove the absence of heat of passion beyond a reasonable doubt when that issue is properly raised.

Real world impact

The decision requires prosecutors to carry the ultimate burden of proving lack of provocation in homicide cases, not defendants. States that had shifted that burden to defendants must instead require proof beyond a reasonable doubt, affecting how juries decide murder versus manslaughter and the sentences that follow.

Dissents or concurrances

A concurring opinion noted the case’s unusual posture: the defendant did not object at trial, and the concurrence highlighted concerns about preserving trial objection rules and comparing this issue to defenses like insanity.