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.

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

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.

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

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

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

Joyce Pelzer killed her ex-girlfriend, Shawndell McLeod, with the help of her new lover. Then, she tried to kill her new wife. Learn what happened in the murder.

Find out how Jason Scott was eventually tied to the murders of two Maryland mother-daughter pairs, Karen and Karissa Lofton, ...

Learn all there is to know about the Delphi Murders and the accused killer Richard Allen, who is set to face trial in the ...

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