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 letter dated April 10, 1989 to a member of his legal team and hand signed at the close, John.
Gacy has included a Chicago White Sox baseball schedule which he is returning because he is a  Chicago Cubs fan.

Includes the original mailing envelope addressed to a member of his legal team and postmarked April 6, 1989 Menard, Illinois.

John Wayne Gacy Signed Letter With Envelope