List of punishments for murder in the United States

Murder, as defined in common law countries, is the unlawful killing of another human being with intent (or malice aforethought), and generally this state of mind distinguishes murder from other forms of unlawful homicide (such as manslaughter). As the loss of a human being inflicts an enormous amount of grief for individuals close to the victim, as well as the fact that the commission of a murder permanently deprives the victim of their existence, most societies have considered it a very serious crime warranting the harshest punishments available. A person who commits murder is called a murderer, and the penalties, as outlined below, vary from state to state. In 2005, the United States Supreme Court held that offenders under the age of 18 at the time of the murder were exempt from the death penalty under Roper v. Simmons. In 2012, the United States Supreme Court held in Miller v. Alabama that mandatory sentences of life without the possibility of parole are unconstitutional for juvenile offenders.