Will 'new' witnesses help Scott Peterson get a new trial?

An A&E docu-series suggests investigators ignored several witnesses who claimed to have seen Laci Peterson walking her dog at a time that would have excluded Scott Peterson as the killer. Nancy Grace examines the claim with forensics anthropologist Dr. Heather Walsh-Haney, psychologist Dr. Bethany Marshall and RadarOnline reporter Alexis Tereszcuk.

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