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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.

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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

When a soldier vanishes from Fort Hood, her family do everything they can to bring attention to her disappearance; Secretary of the Army Ryan McCarthy speaks about the investigation and allegations of sexual assault in the military.

Voices for Vanessa

A man calls 911 to report that his pregnant wife has died by suicide; the case is closed until a suspicious house fire 24 years later leads police to question what really happened that day.

Secrets From the Grave

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Nearly 40 years after a high school senior is found stabbed to death in her car after visiting the mall days before Christmas, investigators identify the killer.

And Then There Were Three

Oscar Pistorius shoots and kills his girlfriend just eight months after competing in the London Olympics, telling police that he believed she was an intruder and he was acting in self-defense.

The Rise & Fall of Oscar Pistorius

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Amber Dubois disappears in the San Diego area and the search turns up nothing. A year later, Chelsea King disappears in a neighboring town. Investigators are determined to find out if the two cases are connected.

S5 E58 | In Plain Sight

E37 | Justice for Nikki

E18 | A Promise to Helene

E17 | Voices for Vanessa

E13 | Secrets From the Grave

E12 | And Then There Were Three

E11 | The Rise & Fall of Oscar Pistorius