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." ...

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 ...

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