>Dennis Rader (March 9, 1945), better known as the BTK Killer, 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, Rader typically targeted women. Rader also initiated a series of taunting letters he sent to police and media outlets, describing his crimes in detail and referring to himself as BTK (for "bind, torture, kill").