American serial killer Dennis Rader, also known as the "BTK killer", murdered his first four victims.

Dennis Rader

American serial killer (born 1945)

Dennis Lynn Rader, better known as the BTK Killer, the BTK Strangler, or simply BTK, is an American serial killer who murdered at least ten people in Wichita and Park City, Kansas, between 1974 and 1991. Although he occasionally killed or attempted to kill men and children,…