Behind Mansion Walls

The show features the actual footage of the daily activities of law enforcement officers throughout the country. The video is combined with firsthand accounts to provide insight into the dangerous situations that officers encounter daily.

The profiles of two condemned men in Oklahoma - Richard Glossip and Justin Sneed - and their two very different accounts of the murder of Barry Van Treese. Richard Glossip waits on death row saying he is an innocent man while Sneed cut a deal: testify against Glossip in exchange for a life sentence.

Real-life tales of tragedy when online acquaintances turn out to be murderous villains in disguise.

"The Perfect Murder" brings viewers some of the most diabolical, perplexing murder cases to land on detectives' desks – the kind of cases that make or break careers and provide fodder for Hollywood mystery movies. These ingenious killers are every detective's worst nightmare. Whether by planting false evidence, or writing anonymous letters to police, these murderers will stop at nothing to stay one step ahead and get away with the perfect murder. In this program, we focus on the investigation, as detectives slowly put the pieces together to unravel the twisted truth. As detectives uncover new evidence, and turn to new suspects, we flashback through stylized reenactment, to depict each possible theory of what may have happened. For the killer, it's THE PERFECT MURDER. Detectives hit dead end after dead end, and wrong suspects are discarded. But one new clue can lead to another and the cold case suddenly gets hot. Truth is, it's the perfect murder... until it's not.

Like trying to decipher the value of a book without ever opening it, judging a person by his or her outward appearance can be a mistake. Someone may look perfect on the outside, but even the most kind-hearted soul has a dark side looming. "Diabolical" is a docuseries that delves into theminds of murderers, asking a simple question: "Why did they do it?" The acts were committed with extreme premeditation -- many were months or even years in the making. Tension builds in each episode as law enforcement taps into the methods of devious masterminds, aided by insights from forensic psychologists and psychiatrists as well as criminal profilers.

The tales of mysterious murders that rocked small-town America. Each hour brings you a new murder mystery and a new look into the evil that can lurk in the heart and soul of a tight-knit community. Interviews with investigators, prosecutors, family members and neighbors piece together the twisting tale of a classic whodunit.