Join or Sign In
Sign in to customize your TV listings
By joining TV Guide, you agree to our Terms of Use and acknowledge the data practices in our Privacy Policy.
The Mark of a Killer Season 3 Episodes
Season 3 Episode Guide
14 Episodes 2021 - 2022
Episode 1
The I-40 Killer
Mon, Apr 12, 202143 mins
A killer is murdering and mutilating young women along the Route 40 corridor in Delaware. But when investigators set up an undercover operation, the hunter soon becomes the hunted.
Episode 2
The I-95 Killer
Tue, Apr 13, 202143 mins
After multiple men are discovered brutally murdered, investigators determine that each victim was last seen with a handsome stranger they met in a bar. Police ask the public for help in tracking down a dangerous drifter before he kills again.
Episode 3
The Charmer
Wed, Apr 14, 202143 mins
A series of women in the Seattle area are found brutally murdered, their bodies posed. Police realize they may have a killer stalking the area nightclub scene, one who is able to charm his victims into submission.
Episode 4
The Englewood Killer
Thu, Apr 15, 202143 mins
Chicago police are investigating the murders of several women, whose bodies are discovered in abandoned buildings barefoot. Evidence indicates there is one offender, now police need to locate him.
Episode 5
Classified to Kill
Fri, Apr 16, 202143 mins
Chicago detectives believe a serial killer is using the classified ads to lure and murder his victims. The investigation is set ablaze when flames obliterate evidence, until police make a shocking discovery.
Episode 6
The Interstate Killer
Sun, Oct 17, 202143 mins
A killer crisscrosses the Midwest leaving a string of victims along the interstate. When investigators are hot on the highway killer's trail, the murderer suddenly changes his mark.
Episode 7
The Grim Sleeper
Sun, Oct 24, 202143 mins
A cold blooded killer conceals his victim bodies with trash, discarding them like garbage in the back alleys across Los Angeles.
Episode 8
The Tourniquet Killer
Sun, Oct 31, 202143 mins
A Houston killer taunts the media and authorities as he uses homemade ligatures to murder his victims.
Episode 9
Deaths in the Desert
Sun, Oct 31, 202143 mins
El Paso investigators race to track down a ruthless killer that is burying his victims in shallow desert graves, dead or alive.
Episode 10
Summer of Fear
Sun, Nov 7, 202185 mins
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.
Episode 11
The Monster
Sat, Apr 2, 202243 mins
Investigators in East Baton Rouge, Louisiana, hunt for a serial murderer who carefully carves up and cuts the bodies of his victims after death.
Episode 12
The Bayou Strangler
Sat, Apr 9, 202243 mins
When multiple victims' bodies are dumped around Louisiana's bayou area, a task force is formed to catch a killer who police believe may have strangled over 20 men.
Episode 13
The Skull Crusher
Sat, Apr 16, 202243 mins
Police in Hartford, Connecticut investigate a string of ruthless killings in the Asylum Hill area committed by a killer with a devastating mark that leaves his victims nearly unrecognizable.
Episode 14
The D.C. Sniper
Sat, Apr 23, 202243 mins
A serial sniper terrorizes the entire D.C. metro area by discreetly targeting random victims out in public and in plain sight.
