From 1987 to 1992, Ontario authorities join FBI profilers to hunt the monster responsible for a horrific spree of rapes, abductions and murders. For years, they come up empty handed, until one tip leads cops to an unlikely suspect.

After finding the prime suspect in a spree of rapes and murders, the Ontario authorities uncover disturbing videotapes that reveal who else was involved in his crimes. When the public learns the sordid details, shockwaves are sent throughout the world.

When college-aged women in Charlottesville, Virginia, start disappearing, the community is shaken to its core. The search for answers lead authorities to an unlikely suspect, a local star athlete named Jesse Matthew Jr.

In a shocking story, investigators discover that Jesse Matthew Jr. kidnapped and killed at least two women, while a third cheats death to become the key witness that brings a murderer to justice.

Sammy "The Bull" Gravano carries out multiple murders for mafia kingpin, John Gotti. After his arrest, he breaks the sacred oath of silence and cuts a deal with the government to testify against his former boss.

As the highest-ranking mobster ever to defect, Sammy Gravano describes the shocking murders of close friends and business partners as well as the secret world of La Cosa Nostra. Despite the bounty on his head, Gravano then returns to the criminal world.

In the fall of 1977, bodies of young women begin piling up on the hillsides of Los Angeles. Almost all of the victims are nude and show signs of torture, and overnight the city becomes gripped with terror over The Hillside Strangler.

As the Los Angeles hillside killings escalate, police receive reports of two suspicious men flashing police badges and asking women to pull over. Suddenly, detectives realize that they're facing not a single serial killer, but a pair working in tandem.

Samantha Koenig is closing shop in Anchorage, Alaska, when a man known in the community as a business owner and caring father approaches her. After her kidnapping, an intense manhunt takes authorities on a cross-country investigation.

After his capture in a nationwide manhunt, Israel Keyes plays cat and mouse with detectives, revealing some details about his crimes and his missing victims. In the end, Keyes had one last surprise for investigators.

John Gotti's expensive suits and swagger earned him the nickname Dapper Don, but in reality, he is a man to be feared. A ruthless and dangerous mafia gangster, John Gotti orders hits on his enemies, his friends and anyone who dares to cross him.

In 1985, John Gotti makes a big move when he organizes the murder of the Gambino boss Paul Castellano and takes the throne as the new godfather. Everyone from law enforcement to other goodfellas considered Gotti dangerous, unpredictable and unstoppable.