Dear Mr. Gacy is a 2010 Canadian drama thriller film directed by Svetozar Ristovski, starring William Forsythe and Jesse Moss. The film is based on Jason Moss's memoir, The Last Victim. As part of his college thesis, Jason Moss (Jesse Moss), a criminology student, decides to write to John Wayne Gacy and attempt to gain his trust through impersonating a typical victim or admirer. Moss sends a carefully crafted letter to John Wayne Gacy (William Forsythe) in prison, portraying himself as a vulnerable, sexually confused boy. The letter is an intricate plan to get inside Gacy's head in hopes of uncovering new information regarding his murders that will aid Moss in writing a standout term paper. The film unfolds as Gacy, suspicious at first, puts Moss through intense emotional tests via letters and collect calls, all of which lead to strained relationships with his girlfriend and family.