Dennis Lynn Rader is an American serial killer and mass murderer who murdered ten people in Sedgwick County (in and around Wichita, Kansas), between 1974 and 1991.

He is known as the BTK killer "BTK" stands for "Bind, Torture, Kill", which was his infamous signature. He sent letters describing the details of the killings to police and to local news outlets during the period of time in which the murders took place.

After a long hiatus in the 1990s through early 2000s, Rader resumed sending letters in 2004, leading to his 2005 arrest and subsequent conviction. He is serving 10 consecutive life sentences at El Dorado Correctional Facility, with an earliest possible release date of February 26, 2180.

One page (front and back) handwritten letter. Letter is general content and is signed Dennis. Hand drawn map of the El Dorado, KS area is included as is the original matching handwritten envelope.