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Find out what happened to Andrea Zamperoni, head chef at a renowned Manhattan restaurant, who vanished and was later found dead in a Queens motel room.

Find out what happened to Margaret Abernathy, 66, found breathing but unresponsive in bloody pajamas in her Georgia home after her daughter called 911.

Andrea Zamperoni's friends and coworkers speak about his happy, upbeat personality even in high stress environments.

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Preview: A grim detail in security footage reveals that Nada Houranieh's fall from a second-story window may not have been accidental.

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Preview: Security footage reveals what initially appeared to be a fall from a second-story window as something much darker.

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After a week of trying to identify the third set of tire tracks found at the scene of Richard Shoeck's murder, the manager of a tire dealership pinpoints the make of the mystery tires.

Investigators find Margaret Abernathy's blood in two rooms of her home. The blood in her bed is dried, while the blood in her bathroom is fresh.