Dennis Lynn Rader (born March 9, 1945) is an American serial killer known as BTK or the BTK Strangler.
Rader gave himself the name "BTK" (for "bind, torture, kill").
Between 1974 and 1991, Rader killed ten people in the Wichita, Kansas metro area.
Rader sent taunting letters to police and newspapers describing the details of his crimes.
After a decade-long hiatus, Rader resumed sending letters in 2004, leading to his 2005 arrest and subsequent guilty plea.
He is serving ten consecutive life sentences at El Dorado Correctional Facility in Kansas.