Douglas Clark was an American serial killer who along with his lover Carol Marie Bundy was convicted in a string of 1980 murders dubbed the Sunset Strip Murders/Slayings. Clark maintained his innocence throughout his incarceration suggesting that the killings were committed by Carol Bundy and Jack Murray who Carol was convicted of decapitating and killing. In the fall of 2015. On October 11, 2023 Clark passed away of natural causes.

8 1/2" x 11" four page handwritten letter hand signed, Doug. Includes a two page titled, Lethally Incompetent Detectives, "Dumb and Deadly" hand signed, Doug.
There is a square sticky also handwritten by Clark along with 2 canceled stamps and a newspaper article all with Clark's handwriting. 
Includes the original mailing envelope completely written by Clark on both sides and hand signed, Douglas Clark.