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.'

Marcia Clark of 'Marcia Clark Investigates the First 48' talks about why she believes Drew Peterson murdered his wife, Stacy Peterson.

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.

Andrew Walsh, deputy chief of the Las Vegas Metropolitan Police Department, on how he used a mannequin as a decoy to catch a suspect in the murders of two homeless men.

Nancy Grace of 'Grace vs. Abrams' spoke with A&E True Crime about whether the double-jeopardy rule should be abolished, recent cases the media isn't paying enough attention to and whether it's opportunistic to report on crime stories.