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. 

3 1/2" x 5" photo sent by Gacy to a friend while he was on death row.
Gacy's infamous Pogo the Clown photograph which he sent to a friend while on death row.
He has written and hand signed on the back, Pogo the Clown aka John W Gacy, Dec 1977.
Includes an 8 1/2" x 11" COA from the original owner who obtained the photo from Gacy.