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

An Unexpected Killer

S2, EP3 "A Genius Murder"

When a brilliant scientist and devoted family man is found beaten to death, the evidence leads to arrests, but an astounding revelation turns the investigation on its head.

An Unexpected Killer

S2, EP4 "Driven to Murder"

When police find the body of a popular taxi driver stuffed inside the trunk of his own car,which is submerged in a river, they struggle to find suspects -- until the truth begins to emerge.

An Unexpected Killer

S2, EP5 "The Love That Kills"

A loving, single mother of two is the victim of a bizarre murder, leading detectives to investigate a number of suspects.

An Unexpected Killer

S2, EP6 "Killed by Kindness"

When a recently divorced mother is found strangled to death on her couch, several suspects emerge until the killer is revealed to be someone close to home.

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.

Mark of a Serial Killer

S2, EP9 "Bound to Kill"

A serial killer taunts Wichita, Kan., for decades by sending brazen letters and taking credit for horrific kills; at the introduction of the computer era, the killer gets sloppy and accidentally leaves a digital clue.

Mark of a Serial Killer

S2, EP10 "Keys to a Killer"

In the 1990s, Louisiana is terrorized by multiple serial killers; the Zachary Police Department discovers the key to solving their cases when a pattern emerges with personal items missing from each local victim.

Mark of a Serial Killer

S3, EP1 "The I-40 Killer"

A killer is murdering and mutilating young women along the Route 40 corridor in Delaware, but after investigators set up an undercover operation, the hunter soon becomes the hunted.

Mark of a Serial Killer

S3, EP2 "The I-95 Killer"

After multiple men are discovered brutally murdered, investigators determine that each victim was last seen with a handsome stranger they met in a bar.

Mark of a Serial Killer

S3, EP3 "The Charmer"

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.

Mark of a Serial Killer

S3, EP4 "The Englewood Killer"

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

Mark of a Serial Killer

S3, EP5 "Classified to Kill"

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

Mark of a Serial Killer

S3, EP6 "The Interstate Killer"

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.

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