In which case did the Supreme Court rule that the death penalty may not be used for punishment on anyone under 18 years of age (when the crime was committed)?

In which case did the Supreme Court rule that the death penalty may not be used for punishment on anyone under 18 years of age (when the crime was committed)?

In Roper v. Simmons case did the Supreme Court rule that the death penalty may not be used for punishment on anyone under 18 years of age (when the crime was committed).