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Dr. Michael Swango took an oath to "do no harm." But he did just the opposite. Suspicious illnesses and deaths followed this once-trusted physician-turned-killer from hospital to hospital for nearly two decades and across two continents. (Repeat).

After a 40-year manhunt, investigators finally unmask California's most prolific serial killer. (Repeat).

The Golden State Killer is identified by law enforcement as Joseph James DeAngelo. (Repeat).

Chronicling the dark life of Robert Hansen, aka The Butcher Baker, one of the most prolific serial killers in Alaska's history. (Repeat).

Recounting the story of a woman who led police to a shocking discovery inside Robert Hansen's home. (Repeat).

A possible case of Munchausen syndrome is investigated after an infant dies of what appears to be toxic levels of antifreeze in his system. (Repeat).

Early one fall morning, Laura Houghteling left her Bethesda home and walked to the station to take a train to work. She was never seen again. A peculiar strand of hair found in Laura's hairbrush enabled investigators to unravel the mystery of her disappearance. (Repeat).

DNA evidence in a 1984 abduction-rape case clears the accused 10 years after the fact. (Repeat).

The 1984 disappearance of a 9-year-old girl in Tucson is investigated. (Repeat).

When a two-year-old boy was rushed to the hospital suffering from brain seizures and breathing difficulties, doctors could not find the cause of his illness. Then the boy's sister provided an important clue, and raised the possibility of a syndrome of which few had ever heard. (Repeat).

Two years pass in the investigation of a missing 18-year-old girl, but the authorities make a breakthrough by re-interviewing her boyfriend and a childhood friend. (Repeat).