We are finally getting some insight into the man who randomly killed a dozen people at the Washington Navy Yard last week. ABC's Devin Dwyer has the latest from Washington.
For the first time, a look at what the victims saw inside Navy Yard building 197. Chilling new FBI video shows a killer on the prowl. Aaron Alexis, armed with a sawed-off shotgun, going room to room.
"There are indicators that Alexis was prepared to die during the attack and that he accepted death as the inevitable consequence of his actions," said Valerie Parlave, Deputy Assistant Director, FBI.
Alexis roamed freely for an hour and a half entering a Navy Yard parking garage in his blue Prius just before 8 a.m. Moments later, cameras catch him walking in through the front door, without any security check. Investigators say he then went to the 4th floor, took out his gun and began stalking targets.
"It appears that Mr. Alexis, in a scenario that we've seen far too often, quite frankly, was a mentally unstable individual," said Ronald C. Machen, Jr., U.S. Attorney, District of Columbia.
Clues to his mental illness were found on the murder weapon. These FBI photos show etchings on the gun's side. One reads, 'end to the torment.' another, 'better off this way.' And in his computer files, the FBI found this note:
" 'Ultra low frequency attack is what I've been subject to for the last three months and to be perfectly honest, that is what has driven me to this'," read Parlave.
It's a sad and haunting explanation for the families of twelve innocent victims... And for authorities now asking how warning signs were missed.
Before the shooting, Alexis had several run ins with police when he complained about hearing voices. But those police reports never made it into the Navy's background check system, something the pentagon wants changed.
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