Reporter good morning, robin. The images are disturbing. In those recent mass shootings, weve not seen the ugly reality of the victims face in the final moments. Today, we do. They are the haunting final moments before aaron alexis begins his killing spree. All captured in chilling, living color. We first see alexis just before 8 00 a. M. , showing his entry pass before being waved in by a security guard. He drives into this parking garage. And moments later, walks into the navy yard through the front door of building 197. Its 8 08 a. M. No metal detector. No bag check. Somewhere hidden, he is carrying this sawedoff shotgun. The fbi says he goes to this bathroom stall on the fourth floor. Takes out the weapon. And reemerges, intent on killing. Hes armed. Peeking around corners. Checking doors. Looking for someone, anyone to ambush and murder. He appears methodical, calm, driven. He moves quickly down the stairwell. And watch as he ducks behind the wall, after spotting potential victims