Currently Available Full Episodes

Keys to a Killer

S2/EP10 |
Aired: 06/13/2020
In the 1990’s, Louisiana is terrorized by multiple serial killers. The small-town PD of Zachary discover the key to solving their cases when a pattern emerges with personal items missing from each local victim. 43:54

Bound To Kill

S2/EP9 |
Aired: 06/06/2020
A serial killer taunted Witchita, Kansas for decades with brazen letters taking credit for his horrific kills. At the introduction of the computer era, the killer gets sloppy and accidentally leaves a digital clue behind in his final taunt to police. 43:54

Killer Athlete

S2/EP8 |
Aired: 05/30/2020
The I-5 corridor in California is taken over by a brazen bandit who terrorizes the highway with a blitz of assaults and murders. The only clue to the identity of the killer is a specific athletic tape used to bind his victims. 43:41

Collar and Leash Killer

S2/EP7 |
Aired: 05/23/2020
A string of 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. 43:54

Hunted to Death

S2/EP6 |
Aired: 05/16/2020
Police have found a string of murdered women in shallow graves in very remote areas of the Alaskan wilderness. After months of searching police zero in on a local family man who’s been living a double life that no one suspected. 43:54

The Smell of Death

S2/EP5 |
Aired: 05/07/2020
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. 43:54

Latest Clips

Derrick Todd Lee Was A Peeping Tom
Exclusive
2:50
Mark of a Killer

Derrick Todd Lee Was A Peeping Tom

S2/EP10 Before her disappearance, serial killer victim Connie Warner had witnessed a peeping Tom lurking outside of her home. Her daughter, Tracy Bryan, and her high school boyfriend also recalled seeing the same man. His description matched that of Derrick Todd Lee, who became known as The Baton Rouge Serial Killer.
DNA Ties Derrick Todd Lee To 'Baton Rouge Serial Killer' Case
Exclusive
2:43
Mark of a Killer

DNA Ties Derrick Todd Lee To 'Baton Rouge Serial Killer' Case

S2/EP10 With a lack of convincing evidence, it took years before investigators could charge Derrick Todd Lee, who became known as The Baton Rouge Serial Killer, with multiple murders in Zachary, Louisiana. With the help of advancing DNA technology, authorities were able to obtain the proof they needed to charge him.
'Baton Rouge Serial Killer' Dies From Heart Disease
Exclusive
1:35
Mark of a Killer

'Baton Rouge Serial Killer' Dies From Heart Disease

S2/EP10 Derrick Todd Lee, who became known as The Baton Rouge Serial Killer, murdered seven women between 1992 and 2003. Lee was sentenced to death by lethal injection in December 2004. He would spend the rest of his days on death row at the maximum-security Louisiana State Prison in Angola before his death from heart disease in 2016.  
Writing The BTK Serial Killer's Biography
Exclusive
2:18
Mark of a Killer

Writing The BTK Serial Killer's Biography

S2/EP9 Forensic psychologist and author Katherine Ramsland spent five yers face-to-face with serial killer Dennis Rader, known as BTK, in order to write his autobiography. "Dennis Rader is definitely a cagey kind of guy, and he always wants to look for his own advantage and whatever angle he wants to use," Ramsland said.
Square Knots Link BTK Killings
Exclusive
1:57
Mark of a Killer

Square Knots Link BTK Killings

S2/EP9 The murders of the four members of the Otero family were nearly four months apart from the murder of Kathryn Bright. Investigators discovered a unique set of square knots that were used to bind the victims of both crime scenes, helping them link both scenes to the same killer — BTK.
Charlie Otero Speaks Out On BTK Killings
Exclusive
3:00
Mark of a Killer

Charlie Otero Speaks Out On BTK Killings

S2/EP9 Charlie Otero spent the majority of his life dealing with the hardship of losing the majority of his family at the hands of Dennis Rader, the BTK serial killer who terrorized Kansas. Years later, the near loss of his son taught him a lesson on the longing for revenge.
Connie Warner And Randi Mebruer
Preview
1:17
Mark of a Killer

Connie Warner And Randi Mebruer

S2/EP10 In April 1992 in the small town of Zachary, Louisiana, investigators are working two murders: Connie Warner and Randi Mebruer. Both women were single mothers who disappeared from their homes just a block apart. In both cases, the victims' keys were missing from the crime scenes. Were they committed by the same killer?
What Happened To Connie Warner?
Preview
2:30
Mark of a Killer

What Happened To Connie Warner?

S2/EP10 On Aug. 24, 1992 in Zachary, Louisiana, Tracy Warner Bryan calls her mother, Connie Warner, who does not answer the phone. Concerned, Tracy calls her grandfather to meet her at her mother's home. When they arrived, Tracy said she "just felt like the house was just not right."
Louisiana Serial Killer Strikes Again
Preview
1:44
Mark of a Killer

Louisiana Serial Killer Strikes Again

S2/EP10 On April 19, 1992 in Zachary, Louisiana, one block from where Connie Warner lived, a little boy was found wandering in his front yard by a neighbor. She called the police department because she was concerned, and they did a welfare check on the boy's mother. Inside, they found a "horrific scene."
The Case Of Randall Woodfield
Exclusive
1:45
Mark of a Killer

The Case Of Randall Woodfield

S2/EP8 Randall Woodfield is a serial killer who is thought to have murdered as many as 44 victims along the West Coast during an eight-month period in the early 1980s. Woodfield, dubbed the "I-5 Killer," is carrying out his sentence at Oregon State Penitentiary, where he is expected to spend the rest of his days.
Randall Woodfield's Warning Signs
Exclusive
2:25
Mark of a Killer

Randall Woodfield's Warning Signs

S2/EP8 In 1981, Randall Woodfield was arrested for a string of murders and assaults along the West Coast. When looking into his background, investigators found that he had been on track to become a professional football player. Woodfield also came from a good town and a good family, but he had some early signals of sexual deviancy.
What Was The I-5 Killer's Mark?
Exclusive
2:17
Mark of a Killer

What Was The I-5 Killer's Mark?

S2/EP8 Randall Woodfield, aka the "I-5 Killer," is suspected of killing as many as 44 people between 1980 and 1981. He briefly played professional football and used athletic tape to both bind his victims and use it as a disguise by placing a strip of it over his nose. "Sports tape is more of an anomaly in terms of binding material," said FBI Criminal Profiler Mark Safarik.
Who Survived The BTK Serial Killer?
Preview
2:17
Mark of a Killer

Who Survived The BTK Serial Killer?

S2/EP9 In October 1974 in the city of Wichita, Kansas, police came across a second crime scene where victims have been purposefully tied up with intricate knots. This time, however, they had a survivor — Kevin Bright. He was able to get a good look at the killer and helped create a composite sketch.
The BTK Serial Killer's Letter
Preview
2:31
Mark of a Killer

The BTK Serial Killer's Letter

S2/EP9 On Feb. 10, 1978, a letter arrives at KAKE-TV, a news station in Wichita, Kansas from the BTK serial killer. The author asked how many more people he had to kill before he got his name in the paper. The killer was looking for media attention, and in the note, he detailed his crimes and victims.
Serial Killer Taunts Wichita
Preview
2:18
Mark of a Killer

Serial Killer Taunts Wichita

S2/EP9 A serial killer taunted Wichita, Kansas for decades with brazen letters taking credit for his horrific kills. At the introduction of the computer era, the killer gets sloppy and accidentally leaves a digital clue behind in his final taunt to police.
Man Wearing Hoodie Assaults 2 Women In Washington
Preview
1:45
Mark of a Killer

Man Wearing Hoodie Assaults 2 Women In Washington

S2/EP8 In Lake Forest Park, Washington on December 21, 1980, authorities in the Seattle suburbs get two 911 calls within the course of an hour. An employee of a local restaurant had entered a restroom, and behind her, an assailant came in with a gun and sexually assaulted her. The attacker then left and told her to wait in the bathroom for five minutes before coming out. Another call soon comes in describing a similar attack 10 minutes away.