Murder, especially Murder of a Police or other Law enforcement officer, Arson when it is known a structure is inhabited by people, Piracy and sky-jacking, Treason. There are others in the Terrorism...
(in the US) These crimes are referred to as 'capital offenses' and, at the state level, nowadays are usually applied only in cases such as murder. Federal laws also include execution for capital...
famous killings serial killings bombings too many manslaughter and extra charge for other things and your crime history along with murder charges and they will not stop the death they need a witness