The murders of teenagers Abby and Libby in their close-knit hometown of Delphi, Indiana spark worldwide headlines. The high-profile case takes a stunning twist after detectives reveal Libby captured a video of the killer shortly before her death - a crucial piece of evidence that helps police track down the murderer. During the two-hour Dateline, correspondent Andrea Canning speaks with insiders in the case, including the defense attorneys for the killer.

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