Morgan v. Illinois, 504 U.S. 719 (1992), is a case decided by the United States Supreme Court.

In an elaboration of the Witherspoon v. Illinois (1968) doctrine, the Rehnquist Court considered challenges to the selection of jurors who would automatically vote to impose the death penalty on a defendant convicted of a capital offense.

Just as a juror who is unalterably opposed to the imposition of the death penalty must be excluded because he or she cannot conscientiously fulfill the oath to follow the law and the instructions to the jury pursuant thereto, so should one who would automatically vote to impose the death penalty be excluded for the same reason.

Such a juror, he emphasized, would lack the qualities of impartiality and indifference required by due process.

Furthermore, Justice White noted, jurors who would automatically vote to impose the death penalty would not "in good faith ... consider evidence of aggravating and mitigating circumstances" as may be required by law and included in jury instructions.