A tragic turn of events in Washington, D.C. as Army Specialist Sarah Beckstrom, 20, succumbs to her injuries after being shot. The suspected shooter, Rahmanullah Lakanwal, a 29-year-old Afghan man, has been arrested. But what led to this devastating incident and what is the fate of the other victim, Air Force Staff Sgt. Andrew Wolfe? Stay tuned for the latest updates.