Pacemaker Signal: Narrowing the Timeline

A significant new development now in the disappearance of Nancy Guthrie. Her children, including NBC's Savannah Guthrie, posted a video on social media calling for her safe return and address reports of a ransom note.  CNN's Ed Lavandera reports from Tucson, Arizona. Also joining 360°, former FBI Deputy Director Andrew McCabe and criminologist Casey Jordan.  

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