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

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

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

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

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

In one of the most eerie and chilling murders in U.S. history, a 17-year-old boy terrorized two Massachusetts families before killing one of them. Daniel LaPlante was caught breaking and entering into ...

Find out how Atlanta civic leader Barney Simms, 70 when fatally shot in his front yard, knew his teen killer Eric Banks, and ...

Find out more about serial killer Chester Turner, who is serving a life sentence for the murders of 14 women, as told in ...

A pattern of violence is shown in two of Joyce Pelzer's relationships.

In 1987, Louis Craine confessed to killing four women. Find out more about the shocking murders in Serial Killer Capital: Los ...

Chester Police Corporal Michael Beverly is found shot to death. His own co-workers work on investigating his killing.

A message on Barney Simms' answering machine mentions suspicious activity on his credit card. This lead points investigators towards a potential suspect.