On December 4, 1978, Billy Milligan, who was charged with the kidnapping, robbery and rape of three women, became the first defendant found not guilty by reason of insanity due to multiple personality disorder, now reclassified as dissociative identity disorder.

Robert A. Jensen, former co-owner of a mass fatality response company, speaks with A&E True Crime about the impact of reuniting families with the material accessories of a life cut short.

The Florida man stole from his family and then murdered his parents and brother after they disapproved of his "relationship" with a Bulgarian cam model he had never met in real life

The officer's murder was investigated by the FBI for more than five decades. And while all of the prime suspects were members of the Ku Klux Klan, no one has ever been charged.

On New Year's Eve 2018, U.S. Army Sergeant, Tyrone Hassel III was murdered by his wife, Kemia Hassel, and her lover, Jeremy Cuellar, who were also soldiers.

According to testimony from friends and family, victims of the "Killer Clown" shared some surprising common connections and tragedies in their lives.

Across the United States, cadaver dogs are used in a variety of crime investigations, ranging from missing persons cases to murder.

In 1999, Cary Stayner, brother of high-profile abduction victim, Steven Stayner, murdered four females at Yosemite National Park. Where is he today?

Sam Kean, author of the book 'The Icepick Surgeon,' discusses unethical undertakings done in the name of science, ranging from Nazi 'medical' experiments to the Tuskegee syphilis study to icepick lobotomies.

Between 2007 and 2009, Anthony Sowell, a former U.S. Marine and convicted sex offender who had served 15 years in prison, murdered 11 women and hid their remains inside his Cleveland home.