The Mark of a Serial Killer, Collar and Leash Killer

Police are hunting for a killer caller who confesses to a string of murders in a chilling, high-pitched voice, begging for forgiveness.

In the summer of 1976, the NYPD are chasing a man shooting at couples in parked cars.

Police release surveillance footage to the press and ask the public for help to find a duffle bag wielding murderer before he strikes again.

Police in New York race against time before he can achieve twelve killings to complete the Zodiac.

When bodies start washing up in the river a pattern emerges, and a small piece of evidence leads police to the house of a model citizen.

After months of searching police zero in on a local family man who's been living a double life that no one suspected.

Detectives are stumped until a 17-year-old girl manages an escape from a vicious kidnapper, leading police to a serial killer.

The I-5 corridor in California is taken over by a brazen bandit who terrorizes the highway with a blitz of assaults and murders.

A serial killer taunted Witchita, Kansas for decades with brazen letters taking credit for his horrific kills.

In the 1990's, Louisiana is terrorized by multiple serial killers.