By age 15, Edmund Kemper had committed two brutal murders and been locked away in a mental institution. When he turned 21, however, he was deemed fit to rejoin society. And that's when the real killing began. Join me as I open the hatch on this man's head and take a quick peek inside the mind of a murderer.

Dennis Rader, aka the BTK Killer, brutalized the Wichita, KS area with a series of vicious murders throughout the 1970s. This is the story of a woman who barely managed to escape his wrath with a single stroke of luck. But a few months later, the killer returned with a terrifying message.

In the early morning hours of May 14, 2008, a 19-year-old college student driving home from a party got his car stuck in a ditch while navigating the back roads of rural Minnesota. But as he contacted his father and attempted to meet him at a nearby location, the call suddenly dropped. And that's the last time anybody ever heard from Brandon Swanson.

Few men have inspired the disgust and awe of polite society to the extent of Ed Gein, a man possessed with a psyche so disturbing it became the backbone of the modern horror film. But while the torment might have been in his mind, the real terrors were inside his home.

February, 1957: The beaten, bruised body a of a deceased young boy is found abandoned in a cardboard box along the side of the road in an undeveloped section of northeast Philadelphia. In the six decades since the crime, nobody has been able to identify him.

July, 1974: It's a beautiful summer afternoon at Lake Sammamish in Issaquah, Washington, a great day for families to have some fun in the sun. But lurking among them is a manipulative sociopath, one with a handsome face, a charming smile, and a burning desire to murder young women.

The Nightstalker was a heartless monster who roamed the streets of Los Angeles in the mid-1980s, unleashing a reign of terror upon its citizens that was finally brought to an end on August 31, 1985, when he was pummeled by an angry mob. Here's how it happened.

On November 28, 1969, 22-year-old Penn State student Betsy Aardsma collapsed to the library floor during a study session, leaving onlookers and medical personnel rushing to her aid. But it soon became apparent this was no emergency; it was murder. Nearly 50 years have passed since, yet no one has ever been brought to justice for the crime.

On April 6, 1996, a 48-year-old New Jersey man was attacked in his apartment by two unknown assailants, and then disappeared without a trace. Soon after, it became apparent to police that his wife of more than 25 years, Rita Gluzman, was the mastermind behind the crime. But where was the body?

A harrowing discovery was made on Halloween morning, 1975, when 15-year-old Greenwich, CT resident Martha Moxley was found bludgeoned to death underneath a tree in the family's backyard. It soon became apparent a monster was lurking somewhere in the shadows of a wealthy, gated community, but more than four decades later, we're still asking one pertinent question. Who really killed Martha Moxley?