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Video footage from closed-circuit video cameras shows Aaron Alexis, now deceased, at the Washington Navy Yard on September 16, 2013. The footage includes the following: - Alexis drives his rental car, a blue Toyota Prius, through the Washington Navy Yard main gate. - Alexis enters Building #197 carrying a backpack. Alexis had legitimate access to the Washington Navy Yard as a result of his work as a contractor and he utilized a valid pass to gain entry to the building. - Alexis moves through the hallways and a stairwell of Building #197 carrying a Remington 870 shotgun.