Dennis Rader also known as the BTK Killer or the BTK Strangler. "BTK" stands for "Bind, Torture, Kill", which was his infamous signature. He sent letters describing the details of the murders to police and local news outlets before his arrest. After a decade-long hiatus, Rader resumed sending letters in 2004, leading to his 2005 arrest and subsequent guilty plea. He is currently serving ten consecutive life sentences at El Dorado Correctional Facility in Kansas.