The BTK killer was Dennis Lynn Rader, an American serial killer who murdered at least ten people in Wichita and Park City, Kansas, between 1974 and 1991. He was nicknamed "BTK" for his modus operandi: Bind, Torture, Kill. Rader taunted police and the media with letters describing his crimes. He lived a seemingly normal life with a family and community involvement but was arrested in 2005 after resurfacing and sending new letters. He pleaded guilty and is serving ten consecutive life sentences in prison.