William Heirens, dubbed "The Lipstick Killer" and convicted of three Illinois murders. Some believe Heirens was framed and is an innocent man. He was known for being Illinois longest incarcerated inmate until his death in March, 2012. 
One page letter dated September 15, 1999 and hand signed, Bill Heirens.
Includes the original prison mailed envelope.

William Heirens Letter Signed with Envelope