Chilling stories of unsolved murders lost in time but never Forgotten

• The Murder of Margaret Blake: On April 23, 1816, Margaret Blake was found in her decrepit cellar apartment, dead from a stab wound. Three people - her husband and two boarders - were present when it happened, but none of them were declared guilty. Modern forensic investigative techniques have been applied to this 200-year-old murder and have resulted in what may be the final solution.

• The Mad Axeman of New Orleans: From 1918-1919, a series of mysterious and gruesome axe murders terrified the Crescent City. The majority of the victims were Italians, but citizens of all backgrounds worried that their skulls would be caved in while they slept. The killer or killers were never caught, but recent research suggests a seminal form of organized crime directed the assaults.

• The Grimes Murders of 1956: A few days before New Year's Eve, 1957, 15-year-old Barbara Grimes and her 13-year-old sister Patricia left their Chicago home to see their idol, Elvis Presley's newest film. Weeks later, their naked bodies were found southwest of the city. Doctors could not pinpoint a primary cause of death and the murders remain unsolved.

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