Marcia Clark of 'Marcia Clark Investigates the First 48' tells A&E True Crime what swayed her in determining who was really at fault for Bonny Lee Bakley's death.

Journalist and therapist Nikki Meredith has corresponded with two of Charles Manson's most infamous followers for decades: convicted murderers Leslie Van Houten and Patricia Krenwinkel. Meredith spoke with us about what the former cult members are like today.

Psychologist Al Carlisle, who was part of a diagnostic team at Utah State Prison who evaluated Ted Bundy, talks about the serial killer's lonely childhood, participation in illegal activities at a young age and strong desire to control women, which Carlisle believes led to his psychopathic tendencies as an adult.

Prosecutor Marcia Clark of 'Marcia Clark Investigates the First 48' on the negative effect the media had on the investigation into what really happened to Chandra Levy.

True-crime author Harold Schechter, author of 'Hell's Princess: The Mystery of Belle Gunness, Butcher of Men,' on what made serial killer Belle Gunness unique and if she tricked everyone into believing she died.

In 1991, four teenage girls were brutally murdered in a yogurt shop in Austin, Texas. The killers have never been caught and the crime has never been solved.

From Slender Man to Robocop to Freddy Krueger and more, read how some killers were inspired by the gruesome actions of fictional villains. And watch our new video on how a group of real armed robbers were influenced by the criminals in 'The Town.'

Samantha Sieber, vice president of Bio-Response Solutions, a company that makes alkaline hydrolysis machines for human disposal, speaks to A&E True Crime about the process of bio cremation and how it's different than the way killers try to get rid of bodies.

Serial killers often live fairly ordinary lives with normal employment, enabling them to blend in with colleagues. Their legitimate jobs also offer them one more key perk: an opportunity to help carry out or conceal their crimes, according to experts.

Marcia Clark spoke with A&E True Crime about a shocking computer search from the Anthony home, revealed on the premiere episode of Marcia Clark Investigates the First 48.