Pat can recall details from all of the cases he worked throughout the course of his long career, but the memories of investigating and capturing serial killers are some of his most vivid.

From the first moment Pat stepped foot into a crime scene as a rookie homicide detective in 1988, until the last time in 2013, Pat used his ability to remember images and details which he could later recall to help him solve the crimes.

What has become one of the most popular U.S. tourist destinations is unfortunately, for Pat, a historical roadmap to every crime scene he ever encountered. Pat revisits some areas of Nashville where he has strong photographic memories of his cases.

Though Ronald Hawkins and Candace Sims knew that their son Robbie was different from an early age, they were unprepared for the violent act that Robbie would commit, a crime that shook the nation. Now they talk about it all on camera.

Danyall White tells the true story of her brother Richard. Danyall always thought he was a prankster who told stories. But when his stories started getting more and more violent, she slowly realized that her brother was hiding a monstrous secret.

Cathy thought she had found the man of her dreams in Peter Tobin. But by the time she discovered his dark secret, it was too late. How would she keep herself and her son alive long enough to escape one of the most evil men in modern history?

To Kevin Currie, Mormon prophet Jeffrey Lundgren was more than a spiritual leader, he was a brother. But before long, Kevin realized that this Man of God was really a devil in disguise with an evil plan.

Bernadette was 17 when her boyfriend, Brian Sugrim, told her he had murdered someone. But she didn’t believe him. Only years later would she realize the true evil that Brian was capable of. Will a monster get away with murder?

Sheila Janutolo dreaded being alone with her husband Jim Cruz. Over the years, she had learned to fear him and his violent temper. But when she got a call that he'd been arrested for a ghastly crime, she was certain police had the wrong man.

Queens, NY, 1965. Two children are found dead. The cops are convinced the parents Eddie and Alice Crimmins are guilty. Even after two trials both condemning Alice, it will take years to unravel the mystery of who killed Eddie and Missy.

New York, NY, 1963. Two young women are brutally murdered in their Upper East Side apartment. If these girls aren’t safe, who is? The NYPD is under pressure to solve the high-profile case but make a tragic misstep while investigating.

West Palm Beach, FL, 1955. Esteemed Judge Curtis Chillingworth and his wife say goodbye to friends at a dinner party and are never seen again. Police unravel a tale of corruption and evil that leaves Florida in shock.

Denver, CO, 1955. United Airlines Flight 629 explodes in mid-air, killing everyone aboard. Crash investigators wonder if it was an accident at all. What follows is the discovery of the first-ever act of murder-by-airplane-bombing in the U.S.

Michigan, 1967-69. A series of young females from Michigan universities are murdered one by one. The young women of Southeastern Michigan are terrified and the police commence a massive hunt for the monster they call The Co-Ed Killer.

New York, NY, 1955. Ann and Billy Woodward are the darlings of New York society when tragedy strikes after a drunken dinner party. Billy lies in a pool of his own blood. Ann pulled the trigger by accident...or so she says.