Ruling 5-4, it determined the death penalty as it was administered, was cruel and unusual punishment.
(from Wikipedia) Furman v. Georgia, 408 U.S. 238 (1972), was a criminal case in which the United States Supreme Court struck down all death penalty schemes in the United States in a 5–4 decision, with each member of the majority writing a separate opinion. Following Furman, in order to reinstate the death penalty, states had to at least remove arbitrary and discriminatory effects, to satisfy the Eighth Amendment to the United States Constitution.