TV To Catch a Killer To Catch a Killer 7.3/10 by 3 users The true gruesome story of John Wayne Gacy - a good friend and helpful neighbour, a great child entertainer, a respectful businessman, and a violent serial killer who raped and murdered over 30 young boys. Details Casts Posters Images Title To Catch a Killer Alternative Titles First Air Date 1992-01-05 Last Air Date 1992-01-06 Number of Episodes 2 Number of Seasons 1 Genres Drama, Crime, Networks CTV, Casts Brian Dennehy, Martin Julien, Margot Kidder, Meg Foster, Michael Riley, Scott Hylands Plot Keywords , John Wayne Gacy Brian Dennehy Koslo Martin Julien Rachel Grayson Margot Kidder Attorney Carlson Meg Foster Joe Kozenczak Michael Riley Paxton Scott Hylands