Character Name : John Wayne Gacy

Original Name : Brian Dennehy

Gender : Male

Character Name : Joe 'Polock' Kozenczak

Original Name : Michael Riley

Gender : Male

Character Name : Rachel Grayson

Original Name : Margot Kidder

Gender : Female

Character Name : Linda Carlson

Original Name : Meg Foster

Gender : Female

Character Name : Ted Koslo

Original Name : Martin Julien

Gender : Male

Character Name : Mike Paxton

Original Name : Scott Hylands

Gender : Male

Character Name : Atkins

Original Name : John Boylan

Gender : Male

Character Name : Williams

Original Name : David Eisner

Gender : Male

Character Name : DeMarco

Original Name : Tony De Santis

Gender : Male

Character Name : King

Original Name : Mark Humphrey

Gender : Male

Character Name : Petrie

Original Name : Gary Reineke

Gender : Male

Character Name : Morris

Original Name : Tim Progosh

Gender : Male

Character Name : Santori

Original Name : Danny Pawlick

Gender : Male

Character Name : Bragg

Original Name : Bruce Ramsay

Gender : Male

Character Name : Alice Pearson

Original Name : Brenda Bazinet

Gender : Female

Character Name : Marcia Kozenczak

Original Name : Liliane Clune

Gender : Female

Character Name : Michael Kozenczak

Original Name : Toby Proctor

Gender : Male

Character Name : Billy

Original Name : Christopher Marren

Gender : Male

Character Name : Walden

Original Name : Gerry Quigley

Gender : Male

Character Name : Barton

Original Name : Nicholas Pasco

Gender : Male

Character Name : Chief Cameron

Original Name : Michael Copeman

Gender : Male

Character Name : Hoskins

Original Name : James Kee

Gender : Male

Character Name : Pam

Original Name : Brigette Lawson

Gender : Female

Character Name : Jake Burns

Original Name : Jay Brazeau

Gender : Male

Character Name : Cindy Beck

Original Name : Cynthia Preston

Gender : Female

Character Name : Vincent Austin

Original Name : Andrew Gillies

Gender : Male

Character Name : Waldron

Original Name : Kurt Reis

Gender : Male

Character Name : Mrs. Gant

Original Name : Judith Goodwin

Gender : Female

Character Name : Mr. Gant

Original Name : Shawn Lawrence

Gender : Male

Character Name : Lorna Gant

Original Name : Jacqueline Graham

Gender : Female

Character Name : Christopher Gant

Original Name : Nicholas Shields

Gender : Male

Character Name : Lisa Kozenczak

Original Name : Sarah Gibney

Gender : Female

Character Name : Debbie Kozenczak

Original Name : Aviva Magner

Gender : Female

Character Name : Mrs. Trask

Original Name : Maureen McRae

Gender : Female

Character Name : Mr. Trask

Original Name : Timm Zemanek

Gender : Male

Character Name : Helen Gacy

Original Name : Maria Ricossa

Gender : Female

Character Name : Sheriff

Original Name : Darryl Palmer

Gender : Male

Character Name : Mr. Miklovich

Original Name : Peter Langley

Gender : Male

Character Name : Detective #1

Original Name : John Friesen

Gender : Male

Character Name : Illinois K-9 Officer

Original Name : Ray Paisley

Gender : Male

Character Name : Stan Wilder

Original Name : Brett Halsey

Gender : Male

Character Name : Gas Station Attendant

Original Name : Elliott Smith

Gender : Male

Character Name : Judge

Original Name : David Gardner

Gender : Male

Character Name : Asst. Principal Burke

Original Name : David Bolt

Gender : Male

Character Name : Foreman Hendricks

Original Name : Thomas Hauff

Gender : Male

Character Name : Older Worker

Original Name : David McAree

Gender : Male

Character Name : Sergeant on Wabash Ave.

Original Name : J. Winston Carroll

Gender : Male

Character Name : Detective on Shakespeare Ave.

Original Name : Don Ritchie

Gender : Male

Character Name : Cemetery Staffer

Original Name : Rudy Webb

Gender : Male

Character Name : Cicero Bar Owner

Original Name : Robbie Rox

Gender : Male

Character Name : Finger Lake Proprietor

Original Name : Larry Reynolds

Gender : Male

Character Name : Man at Bus Station

Original Name : Veliko Pajkovic

Gender : Male

Character Name : Narrator (voice)

Original Name : John Granik

Gender : Male

Character Name : Waiter (uncredited)

Original Name : Luis Guzmán

Gender : Male

Character Name : Pool Player (uncredited)

Original Name : Peter Kerenyi

Gender : Male