Mark of a Killer - 123Movies
- Status: Returning Series
- Genre: Documentary, Crime
- Release: 2019
- Description: All serial killers commit murder to satisfy their grand fantasies, but the murderers featured in this true-crime docuseries take it one step further, committing heinous acts that allow them to extend their fantasies and relive the excitement of their crimes again and again.
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Seasons and Episodes List
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- 24 Hours in Police Custody (2014)
- 60 Days In: Narcoland (2019)
- A Brutal Pact: The Murder of Daniella Perez (2022)
- A Kidnapping Scandal: The Florence Cassez Affair (2022)
- Abuse of Power (2018)
- Active Shooter: America Under Fire (2017)
- Almost Unsolved (2023)
- American Conspiracy: The Octopus Murders (2024)
- American Greed (2007)
- American Manhunt: O.J. Simpson (2025)
- American Murder: Laci Peterson (2024)
- American Nightmare (2024)
- American Ripper (2017)
- America's War on Drugs (2017)
- Amityville: An Origin Story (2023)
- At Witt's End: The Hunt for a Killer (2024)
- Bad Sport (2021)
- Bad Vegan: Fame. Fraud. Fugitives. (2022)
- Beast of Bangalore: Indian Predator (2022)
- Betrayal (2023)