Currently Available Full Episodes

The DC Sniper

S3/EP14 |
Aired: 04/23/2022
A serial sniper terrorizes the entire DC metro area by discreetly targeting random victims out in public and in plain sight. 43:54

The Skull Crusher

S3/EP13 |
Aired: 04/16/2022
Hartford, Connecticut, police investigate a string of ruthless killings in the Asylum Hill area committed by a vicious killer with a devastating mark that leaves his victims nearly unrecognizable. 43:54

The Bayou Strangler

S3/EP12 |
Aired: 04/09/2022
When multiple victims' bodies are dumped around the Louisiana Bayou area, a task force is formed to catch a killer who police believe may have strangled over 20 men. 43:54

The Monster

S3/EP11 |
Aired: 04/02/2022
In East Baton Rouge, investigators are on the hunt for a serial murderer. Their main clue? The killer carefully carves up and cuts the bodies of his victims after death. 43:54

Summer of Fear

S3/EP10 |
Aired: 11/07/2021
Chaos descends on Phoenix as two serial killers compete for the media���s attention and the bodies pile up faster than the police can investigate. 1:25:48

Deaths in the Desert

S3/EP9 |
Aired: 10/31/2021
El Paso investigators race to track down a ruthless killer that is burying his victims in shallow desert graves, dead or alive. 43:54

Latest Clips

In Memory of Chief Charles Moose
Exclusive
2:30
Mark of a Serial Killer

In Memory of Chief Charles Moose

S3/EP14 Captain Bernard Forsythe and Tom Morris, Jr. give homage to Chief Charles Moose of Montgomery County, whom Morris compares to Winston Churchill in his moving and inspiring public speaking skills, particularly when demanding justice for the sniper-like shooting of 13-year-old Iran Brown.
Who Was John Allen Muhammad?
Exclusive
3:00
Mark of a Serial Killer

Who Was John Allen Muhammad?

S3/EP14 John Fabian, a forensic psychologist, goes deep into the profile of John Allen Muhammad, a Desert Storm veteran who took young Lee Boyd Malvo under his wing. Fueled by longtime feelings of abandonment and haunted by his harrowing wartime experience, Muhammad trained Malvo to be a killer.
James Martin Was Shot Sniper-Style
Exclusive
1:11
Mark of a Serial Killer

James Martin Was Shot Sniper-Style

S3/EP14 Surveillance camera footage of the parking lot of Shoppers Food Warehouse in Montgomery County reveals that the shooter of James Martin was nowhere in the vicinity, which implies a long-range, sniper-like attack.
Tina A. Brown Brings Humanity to the Murder Victims
Exclusive
1:58
Mark of a Serial Killer

Tina A. Brown Brings Humanity to the Murder Victims

S3/EP13 Tina A. Brown, a former journalist at The Hartford Courant, recalls her time as a crime reporter and bringing a sense of humanity to the victims of convicted murderer Matthew Steven Johnson.
Matthew Steven Johnson: Disorganized Offender
Exclusive
2:22
Mark of a Serial Killer

Matthew Steven Johnson: Disorganized Offender

S3/EP13 Dr. Joni Johnston, a forensic psychologist, refers to Matthew Steven Johnson as a "disorganized offender," emphasizing the impulsive acts of violence that make him careless ... and traceable.
Dr. Henry Lee Shares His DNA Findings
Preview
9:12
Mark of a Serial Killer

Dr. Henry Lee Shares His DNA Findings

S3/EP13 Dr. Henry Lee, a forensic scientist, discusses the process by which he was able to present Mark Steven Johnson as a murder suspect through his DNA findings. Dr. Lee also emphasizes how important teamwork is in a crime investigation.
Perfecting the Hunt
Exclusive
1:21
Mark of a Serial Killer

Perfecting the Hunt

S3/EP12 How is this serial killer going about his business? He appears to have targeted very specific victims: homeless people, ex-cons, drug addicts and other lost souls who would do anything for money ... and who might not be missed if they were to suddenly disappear.
No Scene at the Crime Scene
Exclusive
2:50
Mark of a Serial Killer

No Scene at the Crime Scene

S3/EP12 Members of the police department in Kenner, Louisianna, describe a relatively serene crime scene where they found a carefully placed body with no signs of struggle. How did the body get there, and what was the cause of death?
Wall of Victims
Exclusive
1:31
Mark of a Serial Killer

Wall of Victims

S3/EP12 Detective Michael Glaser recalls the establishment of a task force based out of the offices of Lafourche Parish, where the displayed photos of the victims of a serial killer provided a constant reminder of their inability to track him down ... and a constant inspiration to keep trying.
Unusual Sexual Interest
Exclusive
2:46
Mark of a Serial Killer

Unusual Sexual Interest

S3/EP11 What are paraphilic disorders? Joni Johnston, forensic psychologist, discusses how rare something like necrophilia actually is ... and how dangerous it can be.
Half a License Plate
Exclusive
1:04
Mark of a Serial Killer

Half a License Plate

S3/EP11 Whose car is that? Investigator Todd Morris recalls his discovery of some incriminating evidence against serial killer Sean Vincent Gillis.
On the Hunt
Exclusive
1:07
Mark of a Serial Killer

On the Hunt

S3/EP11 "I'm sorry, honey bunny." Terri Lemoine describes the moment when her boyfriend Sean Vincent Gillis admitted he was a serial killer.