Security cameras capture the last images of Mackenzie Cowell

      |Watch the last known footage of Mackenzie Cowell as she leaves the Academy of Hair Design and walks to her car in Wenatchee, Wash., before her disappearance on Feb. 9, 2010. For more on the story, watch "Secrets of the the River", Saturday Aug. 9 at 10 p.m. ET/PT on CBS.

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