Clayton Lockett a dangerous guy who was convicted of murder, rape and kidnapping died due to heart attack 29 April 2014. This guy shot 19 year old Stephanie Neiman and later raped friend of Neiman. His execution occurred in Oklahoma State Penitentiary when he was given the first doze of drugs he was not fully unconscious but later known he died of heart attack. This guy was born on 22 November 1975. The family of Stephanie would be relieved after this incident.