Find out what happened to John Altinger, who was brutally killed by budding filmmaker Mark Twitchell, who was obsessed with the serial killer show, Dexter.

Find out what a pathologist said about the murders of Abigail Williams and Liberty German, as Delphi man Richard Allen faces trial.

Get the latest updates on the trial of Richard Allen, who is accused of murdering Abigail Williams and Liberty German in 2017.

The 31-year-old teacher left all her belongings, including her son, at Angelo Smith Jr.’s home.

Investigators find a few drops of blood on the floor by a shattered French door.

What is the new Peacock docuseries Making Manson? Learn more about the show, see the trailer, and uncover new Charles Manson ...

A new docuseries explores one of the most notorious figures of the 20th century and beyond: Charles Manson, an American cult leader, musician ... and mass murderer. Making Manson premieres November 19 ...

Police find a syringe in Gareth Pursehouse's home that is identical to the one found at the scene of Amie Harwick's death.

A syringe filled with yellow-brown liquid is found at the scene of a crime, but what exactly is it?

Friends reflect on Amie Harwick's early life and her drive to leave Pennsylvania to pursue "big things." ...

What is the new Dateline true crime podcast Man in the Black Mask? Learn more about it and find out how to listen.

Liz Golyar's plan to kill Cari Farver involved using digital technology to impersonate her for three years. Find out more ...