Donnie Wahlberg

Self - Host

Casey Jordan

Self - Criminologist, Self - Criminologist & HLN Contributor

Joey Jackson

Self - CNN Legal Analyst, Self - CNN & HLN Legal Analyst, Self - Legal Analyst

Mary Ellen O'Toole

Self - Retired Senior FBI Profiler, Self - Former FBI Profiler

James Gagliano

Self - Retired FBI Supervisory Special Agent, Self - Retired FBI Agent, Self - CNN Law Enforcement Analyst

Geoff Schumacher

Self - V.P. of Exhibits and Programs, The Mob Museum, Self - V.P. of Exhibits and Programming, The Mob Museum

Christopher Holstege

Self - Toxicology Expert, University of Virginia, Self - Co-Author, 'Criminal Poisoning'

John Wayne Gacy

Self - Convicted Serial Killer

Larry King

Self - Television Host

Sammy Gravano

Self - Mafia Informant

Robert Graysmith

Self - Author 'The Sleeping Lady', Self - Cartoonist, San Francisco Chronicle