Learn more about the "Hog Trailer Killer" Daniel Conahan Jr., as told in Oxygen's Unknown Serial Killers of America.

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

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

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.

Preview: A woman and child are found decapitated and wrapped in plastic, but who were they and what happened to them?

A man's bloody torso is found in the back of a truck, and a member of his family becomes the primary suspect in his murder.

Richard Witte is found dead in the back of his truck, but evidence shows that he was killed elsewhere before being placed there.

After beginning an online friendship with Carson Sistrunk, Sierra Inscoe started wanting what belonged to him.