Kenneth Bianchi  is an American rapist and serial killer. He is also known for the Hillside Strangler murders committed with his cousin, Angelo Buono, the pair were convicted of murders committed n Southern California. Bianchi was also convicted of two more murders in Washington state. 

Two page typed letter dated March 9, 2011 hand signed, Ken.
Includes the original prison issued envelope with Bianchi's complete return address in the upper left corner.

Kenneth Bianchi Signed Letter with Envelope Set