John Wayne Gacy aka "Pogo The Clown" and "The Killer Clown" who was executed by the state of Illinois on May 10, 1994. 
9" x 12" envelope postmarked 1993 and stamped on the back 'Legal Mail Only'. This is hand signed in the upper left corner, J.W. Gacy, with his complete return address and the recipient's (a former writer and editor for Playboy magazine) written by Gacy.
Includes a copy of a "Motion To Reconsider and Amend Judgment" three page filing dated September 6, 1992 along with a photocopy of a newspaper article from Friday December 29, 1978.

John Wayne Gacy Signed Legal Mail Envelope With Motion