Mark of a Killer - Season 2

Twin Cities, MN, police are hunting for a killer caller who confesses to a string of murders in a chilling, high-pitched voice, begging for forgiveness. No one can identify him until one woman survives a brutal attack.

In the summer of 1976, the NYPD are chasing a man shooting at couples in parked cars with a gigantic, .44 caliber handgun. He taunts the city with terrifying letters until police get a lead about a suspect who has shot a neighbor's dog. 

Brooklyn shop keepers are afraid of closing time as a killer shoots his victims while locking up their stores. Police release surveillance footage to the press and ask the public for help to find a Duffle bag wielding murderer before he strikes again.

In the 1990s, New Yorkers are on edge as a killer leaves coded clues at crime scenes and declares his compulsion to choose victims based on their birth signs.

A rash of young men go missing around Chicago during the 1970's. When bodies start washing up in the river a pattern emerges. A small piece of evidence leads police to the house of a model citizen where his furnace puts the suspect in the hot seat.

Police discover a string of murdered women in shallow graves in very remote areas of the Alaskan wilderness. After months of investigation, police zero in on a local family man living a double life.

Numerous women are found dead by the side of the road with a unique ligature that looks like a dog collar and leash; 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 terrorises the highway with a blitz of assaults and murders; the only clue to the killer's identity is a specific athletic tape used to bind his victims.

A serial killer taunts Wichita for decades with brazen letters taking credit for horrific kills; at the introduction of the computer era, the killer gets sloppy and leaves a digital clue.

Louisiana is terrorised by multiple serial killers in the 1990s; the Zachary Police Department find the key to solving their cases when they discover personal items missing from each local victim.