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A deadly high-speed chase in Montana leads "Dateline" on a search through 50 years of history to unravel the mystery of how one man turned into a monster and committed one of the state's most notorious crimes.

A deadly high-speed chase in Montana leads "Dateline" on a search through 50 years of history to unravel the mystery of how one man turned into a monster and committed one of the state's most notorious crimes.

The convicted murderer of a popular teacher is given a second chance at freedom when new evidence is revealed.

Archie McFarland was stabbed to death and his murder went unsolved for twenty-five years.

The battle between a wife and a mistress for one man's heart leads to a deadly car chase.

A quiet North Dakota college town is left in fear after student Mindy Morgenstern is found murdered in her off-campus apartment.

When the body of an Ohio woman is found in a wooded area near her home months after she went missing, investigators must determine if her death was a suicide or homicide; the case and trial left Dennis Murphy hungry to know more.

When two sisters' husbands turn up dead within weeks of each other, Florida detectives investigate whether the cases are linked.

After a well-known business owner is found dead in his Lake Orion apartment, investigators are left untangling a web of lies to uncover a deadly duo looking to get rich quick.

When a devoted father is found brutally stabbed to death in his Florida home, detectives turn their focus to the picture-perfect family who appear to have it all.

After a Georgia father is discovered bludgeoned by a hammer in his own bedroom, it takes years for detectives to nail down if this murder is connected to a series of online romances or a case of mistaken identity.

A horrific discovery in a backyard cornfield is just the beginning of an unspeakable scene; as horrors unfold in this small Midwest town, someone is playing a deadly game of cat and mouse, and it will be years before a ghastly truth is revealed.

A land developer disappears into the Arizona desert, and a brother sets out to uncover the truth; when hikers stumble onto a gruesome discovery, investigators quickly realize no one can be trusted when they find themselves in the line of fire.

When a Catholic priest-turned-real estate agent vanishes from Florida, investigators examine circumstances stranger than their suspects; a tip exposes a murder-for-hire scheme.

When a real estate agent disappears, Florida investigators scrutinize the men in her life; however, after other women vanish, something more sinister may be at play; it takes a risky escape from an abductor to finally uncover horrific truths.

The luckiest moment in a man's life gives way to a dark mystery when he vanishes after winning a multi-million-dollar lottery.

A small town is rocked when a popular hostess at the town's favorite tavern disappears; neighbors in the tight-knit community eye each other suspiciously, unaware that the answers may lie beneath the rolling Nebraska Sandhills.

When the popular owner of a boutique motel on an island paradise in Florida disappears amid signs of foul play, the deadly secrets of a quaint beach town slowly work their way up through the pristine white sand.

When a successful lawyer's body is found buried in a South Floridian canal, detectives use innovative technology to follow the gruesome steps taken by an evil killer.

An entrepreneur forges an unlikely friendship with a ragtag group of skateboarders; but when he vanishes and signs point to foul play, police wonder whether he was really a friend or a target.