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Real estate developer Gary Triano lived large and when he was murdered there were whispers of a mob connection, an angry investor, or a mad ex, but the mystery took nearly two decades to unravel.

Dateline

Mystery on Sunrise Drive

A California woman's two former husbands are mysteriously murdered, nearly 20 years apart.

The Black Widow of Lomita

A man steals millions of dollars by conning numerous women and businesses over 25 years; one woman brings together a group of his victims to hold him accountable and make him face justice.

The Perfect Guy

Years after a Montana man is found dead, his son dreads what he'll find when he opens up the box of case files, giving him insight into what really happened.

The Box

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When a young woman is found dead in a field on the outskirts of Green Bay, Wis., a fitness tracker helps detectives solve the mystery.

Justice for Nikki

After a 15-year-old girl disappears, investigators discover a creek where the local teenagers hang out that may hold the answer to her disappearance.

The Creek

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The latest in the case of a missing young Oregon woman whose disappearance led to an intense manhunt after a suspect embarked on a two-state crime spree.

Into the Night

A teen's murder shakes a Nevada community, especially when two unlikely people make confessions.

Under the Desert Sky

A pilot flees following a plane crash, becomes a fugitive and lives a double life for decades.

At the Bottom of the Lake

A 21-year-old college student is found murdered; the case remains cold for nearly 40 years until a new detective uses an innovative method to catch her killer.

A Promise to Helene

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Recently uncovered pages from John Hinckley Jr.'s diary, which he began writing after he was arrested for trying to assassinate President Ronald Reagan; an interview with the officer who questioned Hinckley after the attempted assassination.

S5 E4 | Hinckley: Diary of a Dangerous Mind