Name	Known for
Amanda Barthelemy Self - Melissa's Sister Self - Melissa's Sister See fewer	The Killing Season (2016)
Lynn Barthelemy Self - Melissa's Mother Self - Melissa's Mother See fewer	Monster: Hunting the Long Island Serial Killer (2025)
Melissa Barthelemy Self - Murder Victim (archive footage) Self - Murder Victim (archive footage) See fewer
Peter Brendt Self - Amateur Profiler Self - Amateur Profiler See fewer	The Killing Season (2016)
Joseph Brewer Self - Shannan's Last Client (archive footage) Self - Shannan's Last Client (archive footage) See fewer	Gilgo Beach: Unsolved (2020)
Amber Costello Self - Murder Victim (archive footage) Self - Murder Victim (archive footage) See fewer
Richard Dormer Self - Former Suffolk County Police Commissioner Self - Former Suffolk County Police Commissioner See fewer	The Killing Season (2016)
Joe Foti Self - Former Suffolk County Correctional Officer (voice) Self - Former Suffolk County Correctional Officer (voice) See fewer	The Killing Season (2016)
Lauren Franklin Self - Associate Producer Self - Associate Producer See fewer	Night School (II) (2016)
Vernon Geberth Self - Author, Practical Homicide Investigation Self - Author, Practical Homicide Investigation See fewer	The Bone Collector (1999)
Mari Gilbert Self - Shannan's Mother Self - Shannan's Mother See fewer	Crime Watch Daily (2015)
Shannan Gilbert Self - Murder Victim (archive footage) Self - Murder Victim (archive footage) See fewer
Sherre Gilbert Self - Shannan's Sister Self - Shannan's Sister See fewer	Disappeared (2009)
Nancy Grace Self (archive footage) Self (archive footage) See fewer	Midnight Special (2016)
Tricia Griffith Self - Host, True Crime Radio Self - Host, True Crime Radio See fewer	The Killing Season (2016)
Thomas Hargrove Self - Investigative Reporter Self - Investigative Reporter See fewer	Proof of Life (2000)
Robert Kolker Self - Author, Lost Girls Self - Author, Lost Girls See fewer	Bad Education (2019)
Jeff Martina Self - Melissa's Stepfather Self - Melissa's Stepfather See fewer	Monster: Hunting the Long Island Serial Killer (2025)
Rachel Mills Self - Filmmaker Self - Filmmaker See fewer	The Magnitudinous Illuminous (2018)
Kimberly Overstreet Self - Amber's Sister Self - Amber's Sister See fewer	Monster: Hunting the Long Island Serial Killer (2025)
Michael Pak Self - Shannan's Driver (archive footage) Self - Shannan's Driver (archive footage) See fewer	A&E Presents: The Long Island Serial Killer (2011)
Mark E. Safarik Self - Former FBI Profiler (as Mark Safarik) Self - Former FBI Profiler (as Mark Safarik) See fewer	Dreaming Darkly
Dave Schaller Self - Amber's Housemate Self - Amber's Housemate See fewer	Monster: Hunting the Long Island Serial Killer (2025)
Super Self - Escort Self - Escort See fewer	The Killing Season (2016)