Dear Mr. Gacy

William Forsythe

John Wayne Gacy

Jesse Moss

Jason Moss

Emma Lahana

Alyssa

Cole Heppell

Alex Moss

Belinda Metz

Valerie Moss

Michael Ryan

Frank Moss

Eric Keenleyside

Stan

Daryl Shuttleworth

Guard Thompson

Patrick Gilmore

Glen Phillips

Andrew Airlie

Professor Harris

Michael Kopsa

FBI Agent

Jeffrey Bowyer-Chapman

Male Hustler

Hunter Elliott

Butcher Shop Victim

Michaela Mann

Prostitute

Dee Jay Jackson

Desk Guard

Libby Osler

Counter Girl

Brett Dier

Marcus

James Ralph

Armed Guard

Jaren Brandt Bartlett

Mike

Lynn Colliar

TV News Reporter

Richard Harmon

Victim

Andrea Brooks

Stalked Girl

Anthony Shim

Paul

Karissa Tynes

Amy

Josh Goring

Marcus' Friend (uncredited)

Kai Kennedy

Bobby (uncredited)

John Andrew Vaas

Undercover Detective (uncredited)

Svetozar Ristovski

Director

Carol Green-Lundy

Script Supervisor

Brett McCord

Third Assistant Director

Bryant Marshall

Second Assistant Director

Michele E. Dutka

First Assistant Director

Kellie Madison

Screenplay

Jason Moss

Novel

Jeffrey Kottler

Novel

Clark Peterson

Story

Ferne Cassel

Casting

Candice Elzinga

Casting

Gordon Yang

Producer