Nearly four years after the murders of Abby & Libby, HLN returns to Delphi with new questions and learns new exclusive information about the video on Libby’s phone, and new information about the case’s path forward. To learn more about how HLN protects listener privacy, visit cnn.com/privacy

Down The Hill: The Delphi Murders

Chapter 10: Four Years

Abby and Libby - 2 young girls murdered. Investigators are searching for the killer using their biggest clue: a recording of his voice from one of the victims' phones ordering the girls Down the Hill. Almost three years later, it's a mystery that still haunts the small town of Delphi, Indiana while police say the killer may walk among them.

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Down The Hill: The Delphi Murders