(born March 9, 1945) Dennis Lynn Rader is an American serial killer who murdered ten people in Sedgwick County, Kansas between 1974 and 1991. He is also known as the BTK Killer or the BTK Strangler. "BTK" stands for "Bind, Torture, Kill," which was his infamous signature. All of Rader's known crimes occurred in Kansas. He killed ten people in total and collected items from each murder scene. He sent letters describing the details of the murders to police and local news outlets before his arrest. After a decade-long hiatus, Rader planned to resume killing and began once again sending letters in 2004. This led to his 2005 arrest and subsequent guilty plea. He is currently serving ten consecutive life sentences at El Dorado Correctional Facility in Kansas.