For True Crime buffs who love the twists and turns of a criminal investigation, Oxygen True Crime has a deep library of shows that ask the provocative questions, run exhaustive investigations and look for ways that  justice always is served

Mark of a Serial Killer

S3, EP9 "Deaths in the Desert"

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

Mark of a Serial Killer

S3, EP10 "Summer of Fear"

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.

Mark of a Serial Killer

S3, EP11 "The Monster"

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

Mark of a Serial Killer

S3, EP12 "The Bayou Strangler"

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.

Mark of a Serial Killer

S3, EP13 "The Skull Crusher"

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.

Mark of a Serial Killer

S3, EP14 "The D.C. Sniper"

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

S1, EP1 "Posed to Kill"

In 1990, a serial killer terrorizes the University of Florida's campus, killing five students in under four days; the Gainesville Ripper leaves behind a crime scene where all the victims have been stabbed but the females have been posed like dolls.

Mark of a Serial Killer

S1, EP2 "The Last Call Killer"

In New Jersey four bodies are found dismembered, bagged, and thrown in roadside garbage cans; the "Last Call Killer" hunted his victims openly in piano bars but no one suspected he could be hiding in plain sight, working as a local nurse.

An Unexpected Killer

S2, EP7 "New Jersey Nightmare"

A recently retired woman is found murdered, and detectives struggle with a lack of evidence and try to track down a long list of suspects.

An Unexpected Killer

S2, EP8 "Fatal Ambition"

A hard-working young woman is discovered stabbed at the side of a road, leading police on a tireless investigation for 10 years to unveil a killer who is hiding in plain sight.

An Unexpected Killer

S2, EP9 "Deadly Disrespect"

After a 35-year-old analyst for the NSA is fatally stabbed, police look at a number of suspects; detectives close in on the killer, but the investigation takes a shocking turn.

An Unexpected Killer

S2, EP10 "Closet Murderer"

When a 98-year-old widow is found dead in her entryway closet, a chilling discovery leads investigators to a killer in the community who harbors a dark secret.

An Unexpected Killer

S2, EP11 "Murderer on Main St."

A beloved resident of a tight-knit Nebraska town is murdered, leading detectives to look at a wide range of suspects before the trail leads to a killer who lives among them.

An Unexpected Killer

S2, EP12 "The Mayor's Wife"

After a respected educator and mother of two is found dead in small-town Alabama, the investigation focuses on fraught family relationships, but the discovery of a dark secret unveils a killer no one saw coming.

An Unexpected Killer

S2, EP13 "Hidden Betrayal"

A civic-minded teen is shot to death in his own bed, but just as investigators are closing in on those responsible, a twist leaves everyone stunned.

An Unexpected Killer

S2, EP14 "Gone Without a Trace"

A divorced mother of three is stabbed to death while recovering from major surgery, but police are frustrated by a lack of evidence, until a startling admission reignites the case.

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