• 
  Joshua Zeman

   Himself (2016) (8 episodes, 2016)
• 
  Rachel Mills

   Herself (2016) (8 episodes, 2016)
• 
  Peter Brendt

   Himself (4 episodes, 2016)
• 
  Thomas Hargrove

  Self - Investigative Reporter
• 
  Amanda Barthelemy

  Self - Melissa's Sister
• 
  Gregory Cooper

  Self - Former National Program Manager of ViCAP
• 
  Richard Dormer

  Self - Former Suffolk County Police Commissioner
• 
  Vernon Geberth

  Self - Author, Practical Homicide Investigation

• 
  Sara Karnes

  Self - Maureen's Friend
• 
  Robert Kolker

  Self - Author, Lost Girls
• 
  Christine Barber

  Self - Director of Street Safe New Mexico
• 
  Mike Chitwood

  Self - Daytona Beach Police
• 
  Lauren Franklin

  Self - Associate Producer
• 
  Theresa Fresquez

  Self - Nina Herron's Mother
• 
  Alyssa Gage

  Self - Daughter of Stacey Gage

• 
  Mari Gilbert

  Self - Shannan's Mother
• 
  Tricia Griffith

  Self - Host, True Crime Radio
• 
  Terry Oleson

  Self - Golden Key Motel Handyman
• 
  Kimberly Overstreet

  Self - Amber's Sister
• 
  Khalil White

  Self - Jessica Taylor's Boyfriend
• 
  Walter Pacheco

  Self - Journalist
• 
  Kenna Quinet

  Self - Author, The Missing Missing
• 
  Diana Washington-Valdez

  Self - Investigative Reporter
• 
  Bill Warner

  Self - Private Investigator