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

S1, EP5 "Momentos of Murder"

When the Hillside Stranglers are caught police realize they still have another serial killer running rampant in Los Angeles; he tortures and toys with his model victims while keeping pieces of their jewelry as he snaps their last photo ever.

Mark of a Serial Killer

S1, EP6 "An Appetite for Murder"

Texas authorities have a killer riding the rails and leaving a literal trail of bread crumbs after eating at victims' tables; when more murders are linked, the FBI names a Most Wanted suspect and a national manhunt for The Railroad Killer ensues.

Mark of a Serial Killer

S2, EP1 "Killer Caller"

Minnesota police hunt for a killer caller who confesses to a string of murders in a chilling, high-pitched voice, begging for forgiveness; no one can identify him until one woman survives a brutal attack.

Mark of a Serial Killer

S2, EP2 "Deadly Summer"

In the summer of 1976, the NYPD are chasing a man shooting at couples in parked cars with a gigantic, .44 caliber handgun; he taunts the city with terrifying letters until police get a lead about a suspect who has shot a neighbor's dog.

Mark of a Serial Killer

S2, EP3 "Deadly Design"

Brooklyn shop keepers are afraid of closing time as a killer shoots his victims while locking up their stores.

Mark of a Serial Killer

S2, EP4 "The Other Zodiac"

In the 1990's, New York is on edge as a killer leaves coded clues at crime scenes and declares his compulsion to choose victims by their birth signs.

Mark of a Serial Killer

S2, EP5 "The Smell of Death"

A rash of young men goes missing around Chicago during the 1970s; when bodies start washing up in the river, a pattern emerges; a small piece of evidence leads police to the home of a model citizen, where his furnace puts the suspect in the hot seat.

Mark of a Serial Killer

S2, EP6 "Hunted to Death"

Police find a string of murdered women in shallow graves in very remote areas of the Alaskan wilderness; after months of searching, police zero in on a local family man living a double life that no one suspects.

An Unexpected Killer

S3, EP13 "A Silent Death"

A beloved teacher and mother of four silently vanishes in the middle of the night; a blood-soaked bedroom and lakeside discovery point police to a killer close to home until mysterious tracks in the mud lead to a culprit no one suspected.

An Unexpected Killer

S3, EP14 "Death on the Driveway"

When a loving father of two is gunned down on his driveway, police uncover a hidden affair and workplace grudges before a nervous witness and chilling confession reveal a vicious vendetta from a killer no one expected.

An Unexpected Killer

S3, EP15 "A Family Affair"

When a family that runs a beloved vet clinic is gunned down, police investigate disgruntled tenants, a pet owner with an ax to grind and an estranged son; the case stalls until detectives uncover a twisted plot by someone who seemed above suspicion.

In Ice Cold Blood

S2, EP15 "Secrets and Lies"

A beloved entrepreneur is murdered in his office; a secret double life is quickly revealed, and despite mountains of suspicion, lies and motives, his killer is not who one would assume.

In Ice Cold Blood

S2, EP16 "Mother vs. Son"

A man is found dead in the shower, and police have only two suspects, but to figure out who killed him and why, is not as cut and dry as it may seem.

In Ice Cold Blood

S3, EP1 "Swimming With Sharks"

A teenage girl is found beaten to death at the neighborhood pool, launching her father on a mission to catch her killer that ultimately changes crime fighting forever.

In Ice Cold Blood

S3, EP2 "Widowed Witness"

A brutal attack leaves witness to a murder; but when the police find the killer, it turns out the intended victim, and the motive, were not what anyone imagined.

In Ice Cold Blood

S3, EP3 "Guilty as Charged"

When a prominent attorney is found savagely stabbed to death in her office, investigators find themselves with a long list of suspects from violent felons to lesbian love triangles; in the end, they find a killer as cold as they come.

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