Dennis Lynn Rader is an American serial killer known as BTK, the BTK Strangler or the BTK Killer. Between 1974 and 1991, BTK killed ten people in Wichita and Park City, Kansas. Rader pleaded guilty and was sentenced to to 10 consecutive life sentences.
 
Didache paperback book. Property room stamped on the inside on the back of the cover. Rader has handwritten a note and with a hand drawn cross and sun and hand signed, Dennis L. Rader.
Includes two 8 1/2" x 11" Request/Authorization to Remove Personal Property documents. The yellow and the pink copies. 
Also included is the original mailing envelope completely written by Rader and hand signed, Dennis L. Rader."