In three decades as a forensic psychologist, Dr. Kris Mohandie has met one-on-one with some of the most violent men ever to grab headlines: Joseph Paul Franklin, Herb Mullin, Willie Woods and others. He talks to us about whether violent criminals are born or made.

Special agents Javier Peña and Steve Murphy detail the rise of their careers and their eventual partnership with agents in Colombia, where they helped bring down Pablo Escobar’s Medellin Cartel.

Ethan Brown, a reporter who spent years investigating the murders of eight sex workers in Jennings, Louisiana and wrote the book 'Murder in the Bayou,' says there's credible evidence to suggest that several offenders have blood on their hands, and that Jefferson Davis Parish's own law enforcement may be implicated in the crimes.

The true crime audience skews largely female, sparking some to question why the genre is so popular among some women. But in Rachel Monroe's book 'Savage Appetites,' she reverses that gaze, turning the lens toward four women who she thinks embody or challenge four classic archetypes of the genre: Detective, Victim, Defender and Killer.

Israel Keyes—a murderer who perplexed even the FBI's top minds in criminal profiling—traveled America leaving 'kill kits' with weapons and other items in secluded locations, picking them up before abducting and murdering a chosen victim.

How did Charles Manson, an illiterate ex-con, become such an influential cult leader and turn a group of peaceful hippies into cold-blooded killers? Journalist Tom O'Neill set out to answer this and more in his book, 'Chaos.' Read about Manson's early years—starting with his neglectful mother, then moving on to his stints in institutions for 'delinquent' children and ultimately, in federal prison.

In three decades as an undercover operative for the Bureau of Alcohol, Tobacco, Firearms and Explosives, Vincent A. Cefalu risked his life investigating groups from outlaw motorcycle gangs to the Ku Klux Klan. Cefalu spoke with us about the undercover moments that frightened him most.

On February 1, 1890, Helen Potts, a young woman of wealth and privilege overdosed on morphine and died while attending a prestigious New York City finishing school. Her husband, a handsome med student named Carlyle Harris whom she had married in secret, had prescribed her some pills containing the drug after she complained to him about chronic headaches. But the pills contained enough morphine to kill a person—and Harris knew it. It was his plan all along.

Former FBI special agent John Douglas spent his 25-year career with the Bureau interviewing hundreds of America's most infamous killers, from Charles Manson and Ted Bundy to the 'BTK Killer,' Dennis Rader and more. The 'Mindhunter' author talks to us about his new book, 'The Killer Across the Table,' and his tried-and-true interview techniques.

The actor talks about his late wife Michelle McNamara's role in helping identify the Golden State Killer suspect.