Nash v. Illinois

Background

A man was convicted of murder largely on the testimony of an accomplice, William Triplett. At trial Triplett denied receiving any promise of leniency for his testimony. The prosecutor knew that denial was false, but the jury heard Triplett’s testimony under the impression he had received no benefit. Later, after the defense called witnesses, the prosecutor and Triplett’s lawyer admitted that the prosecutor had promised leniency if Triplett testified.

Reasoning

The Supreme Court denied review of the conviction. In a dissent, Justice Fortas argued the case should be decided under the rule of Napue v. Illinois, which holds that a prosecutor’s knowing acceptance of false testimony can deprive a defendant of a fair trial. Fortas said the jury’s initial, false impression that the witness received no benefit might not be undone by later admissions, and that prosecutorial misconduct has no place in the criminal justice system.

Real world impact

Because the Court declined to hear the case, the lower-court conviction remained in place for now. The dissent warns that when prosecutors knowingly allow a cooperating witness to lie about deals, convictions—especially in capital cases—may be unreliable and could merit reversal. The opinion highlights the high stakes when witness benefits are concealed from jurors.

Dissents or concurrances

Justice Fortas, joined by the Chief Justice and Justice Douglas, would have granted review and reversed, emphasizing that a prosecutor’s knowing acquiescence in a witness’s false denial of leniency requires reversal to protect a fair trial.