John Wayne Gacy aka the "Killer Clown" and "Pogo the Clown" was a Des Plaines, Illinois serial killer convicted of 33 murders executed by the state of Illinois via lethal injection on May 10, 1994.  
Bollman brand wool hat which was ownd by Gacy prior to his arrest. This was obtained along with a number of other personal items from a former member of his legal team.