Brian Dennehy
John Wayne Gacy
Michael Riley
Joe 'Polock' Kozenczak
Margot Kidder
Rachel Grayson
Meg Foster
Linda Carlson
Martin Julien
Ted Koslo
Scott Hylands
Mike Paxton
John Boylan
Atkins
David Eisner
Williams
Tony De Santis
DeMarco
Mark Humphrey
King
Gary Reineke
Petrie
Tim Progosh
Morris
Danny Pawlick
Santori
Bruce Ramsay
Bragg
Brenda Bazinet
Alice Pearson
Liliane Clune
Marcia Kozenczak
Toby Proctor
Michael Kozenczak
Christopher Marren
Billy
Gerry Quigley
Walden
Nicholas Pasco
Barton
Michael Copeman
Chief Cameron
James Kee
Hoskins
Brigette Lawson
Pam
Jay Brazeau
Jake Burns
Cynthia Preston
Cindy Beck
Andrew Gillies
Vincent Austin
Kurt Reis
Waldron
Judith Goodwin
Mrs. Gant
Shawn Lawrence
Mr. Gant
Jacqueline Graham
Lorna Gant
Nicholas Shields
Christopher Gant
Sarah Gibney
Lisa Kozenczak
Aviva Magner
Debbie Kozenczak
Maureen McRae
Mrs. Trask
Timm Zemanek
Mr. Trask
Maria Ricossa
Helen Gacy
Darryl Palmer
Sheriff
Peter Langley
Mr. Miklovich
John Friesen
Detective #1
Ray Paisley
Illinois K-9 Officer
Brett Halsey
Stan Wilder
David Gardner
Judge
David Bolt
Asst. Principal Burke
Thomas Hauff
Foreman Hendricks
David McAree
Older Worker
J. Winston Carroll
Sergeant on Wabash Ave.
Don Ritchie
Detective on Shakespeare Ave.
Rudy Webb
Cemetery Staffer
Elliott Smith
Gas Station Attendant
Robbie Rox
Cicero Bar Owner
Larry Reynolds
Finger Lake Proprietor
Veliko Pajkovic
Man at Bus Station
John Granik
Narrator (voice)
Luis Guzmán
Waiter (uncredited)
Peter Kerenyi
Pool Player (uncredited)