Caught on Tape: Navy Yard Shooter Seen in Video Before Rampage

"The haunting final moments before Aaron Alexis begins his killing spring, all captured in chilling, living color."

This video reveals Alexis's final moments before his killing spree. This video shows Alexis his entry pass, being waved in by a security guard, then entering through the front door of building 197 of the Navy Yard - no metal detector, no bag check. Next he enters a bathroom where he enters a bathroom stall on the fourth floor, where he takes out his fatal weapon.