Warning Signs

Terry Sullivan

Self - Fmr. Prosecutor, Cook County, IL

John Wayne Gacy

Archive footage

Craig Bowley

Self - John Gacy Prison Correspondent

Jay Levine

Self - Ret. News Anchor & Chief Correspondent

David Hachmeister

Self - Ret. Des Plaines Police Officer

Rafael Tovar

Self - Ret. Des Plaines Police Detective

Lawrence Finder

Self - Fmr. Prosecutor, Cook County, IL

Michael Albrecht

Self - Ret. Des Plaines Police Officer

Karen Kuzma

Self - John Gacy's Sister

David Dutton

Self - Fmr. Prosecutor, Black Hawk County, IA

William Kunkle

Self - Fmr. Chief Prosecutor, Cook County, IL

Ray Cornell

Self - John Gacy's Former Friend

Marty Zielinski

Self - Photographer

Carole Lofgren

Self (archive footage) (voice)