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A serial sniper terrorizes the entire D.C. metro area by discreetly targeting random victims out in public and in plain sight.

Mark of a Serial Killer

The D.C. Sniper

Police in Hartford, Conn., 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.

The Skull Crusher

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.

The Bayou Strangler

Investigators in East Baton Rouge, La., hunt for a serial murderer who carefully carves up and cuts the bodies of his victims after death.

The Monster

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.

Summer of Fear

El Paso investigators race to track down a ruthless killer who is burying his victims in shallow desert graves, dead or alive.

Deaths in the Desert

A Houston killer taunts the media and authorities as he uses homemade ligatures to murder his victims.

The Tourniquet Killer

A cold-blooded killer conceals his victims' bodies with trash, discarding them like garbage in the back alleyways of Los Angeles.

The Grim Sleeper

A killer crisscrosses the Midwest leaving a string of victims along the interstate, but when he realizes investigators are hot on his trail the murderer suddenly changes his mark.

The Interstate Killer

Chicago detectives believe that a serial killer is using classified ads to lure and murder his victims.

Classified to Kill

Chicago police investigate the murders of several women, whose bodies are discovered in abandoned buildings barefoot.

The Englewood Killer

After a series of women in the Seattle area are found brutally murdered with their bodies posed, police realize that they might have a killer stalking the area nightclub scene who is able to charm his victims into submission.

The Charmer

Following serial killers on the trails of their obsession and taking a deep dive into the killers' depraved psyches to reveal their darkest secrets as investigators close in to end the killers' reign of terror.

S3 E7 | The Grim Sleeper