John Wayne Gacy aka the "Killer Clown" and "Pogo the Clown" was a Des Plaines, Illinois serial killer convicted of 33 murders and who was executed by the state of Illinois via lethal injection on May 10, 1994. 

8 1/2" x 11" typed one page letter dated August 3, 1983 sent by Gacy to the Cook County coroner's office. Typed signed, John Gacy.

John Wayne Gacy Cook County Coroner's Office Letter