Wilson v. Corcoran

Background

Joseph Corcoran was convicted of killing four people and sentenced to death by an Indiana jury and judge. The Indiana Supreme Court initially sent the case back because the trial judge might have relied on nonstatutory factors when imposing the death penalty, and later affirmed the sentence after the trial court clarified its reasoning. Corcoran then sought federal review, and lower federal courts addressed different parts of his challenge at different times.

Reasoning

The central question was whether a federal court may grant a writ of habeas corpus — a federal review of a state prisoner's detention — based only on a state-law sentencing error. The Court explained that federal habeas relief is available only when a state prisoner’s custody violates the U.S. Constitution or federal law. Because the Court of Appeals granted relief without finding any federal-law violation and treated a state-law error as sufficient, the Court vacated the appeals court’s judgment and sent the case back for further proceedings.

Real world impact

This decision limits federal courts’ ability to overturn state sentences for mistakes under state law alone. State prisoners must show a federal constitutional or statutory violation to get federal habeas relief. The Court did not decide the underlying merits of Corcoran’s claims; it only required lower courts to identify a federal violation before granting relief.