John Wayne Gacy

~ as ~

Self (archive footage)

Robert K. Ressler

~ as ~

Self - Ret. FBI Profiler (archive footage)

Terry Sullivan

~ as ~

Self - Fmr. Prosecutor, Cook County, IL

Jay Levine

~ as ~

Self - Ret. News Anchor & Chief Correspondent

Rafael Tovar

~ as ~

Self - Ret. Des Plaines Police Detective

Lawrence Finder

~ as ~

Self - Fmr. Prosecutor, Cook County, IL

Karen Kuzma

~ as ~

Self - John Gacy's Sister

Craig Bowley

~ as ~

Self - John Gacy Prison Correspondent

David Hachmeister

~ as ~

Self - Ret. Des Plaines Police Officer

Michael Albrecht

~ as ~

Self - Ret. Des Plaines Police Officer