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" one page handwritten letter dated April 8, 1985 which was written to a member of Gacy's legal team letting them know about a birthday present which they were sending on behalf of Gacy.