John Wayne Gacy

Self - Serial Killer

Robert Piest

Self - Murder Victim

John Butkovich

Self - Murder Victim

Greg Bedoe

Self - Investigator, Cook County

Sam Amirante

Self - Gacy's Criminal Attorney

Rafael Tovar

Self - Des Plaines P.D.

Mike Albrecht

Self - Des Plaines P.D.

Terry Sullivan

Self - Prosecutor, Cook County

Steve Nemmers

Self - Waterloo, Iowa Resident

John Szyc

Self - Murder Victim

John Stanley Gacy

Self - John Wayne Gacy's Father

Gregory Godzik

Self - Murder Victim

Michael Bonnin

Self - Murder Victim

Kim Byers-Lund

Self - Rob Piest's Friend

Patti Vasquez

Self - Michael Bonnin's Sister

Dan Genty

Self - Evidence Technician, Cook County Sheriff's Office

Martha Fourt

Self - Gay Rights Activist

Ron Robinson

Self - Des Plaines P.D.