Bryan Kohberger Stashes 'Momento' of Quadruple Stabbing Victim

The search of Bryan Kohberger's family home turned up an ID belonging to one of the Idaho student murders victims. Cold Case Investigative Research Institute Founder, Sheryl McCollum joins Nancy Grace to weigh in on the report. Is this the state's 'smoking gun'? Why do murderers keep 'souvenirs?

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