When someone takes the life of another, regardless of intent or other details surrounding the incident, it is called a homicide. Homicide is not always a crime, such as in cases of self-defense or the state-sanctioned execution of certain convicted criminals. Criminal homicides involve either negligence or willful intent, ranging from involuntary manslaughter (killing another motorist in a drunk driving accident, for example) to first degree murder (stalking and killing a member of a rival gang, for instance). Sentences also vary widely, depending on the severity of the crime and other mitigating factors. For example, some states sentence convicted murderers to death but provide psychiatric treatment to those acquitted by reason of insanity. This section provides in-depth information about homicide in its various forms.