Roper v. Simmons, 543 U.S. 551 (2005)

In Roper v. Simmons, 543 U.S. 551 (2005) the United States Supreme Court held it to be unconstitutional to impose the death penalty on those who committed a crime as a minor.  Under the evolving standards of decency test, the Court held that executing a person who was a minor at the time of the murder amounted to cruel and unusual punishment.  The court noted that at the time that the United States and Somalia were the only countries in the United Nations that did not expressly forbid the death penalty for crimes committed by a juvenile.