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Picture of Washington Navy Yard gunman emerges
Chris Hayes gives the latest details on Aaron Alexis, the alleged Navy Yard shooter, and speaks with Dave Cullen, the author of "Columbine" about how reporters cover mass shootings, and the shooters responsible for them.
The inexplicable weirdness of Rick Scott04:31
Bad news for some blue state GOP governors05:30
Leaks from the Mike Brown investigation surface07:27
Amazing video of Ottawa post office evacuation01:35
Who was the Ottawa gunman?07:38
Shooting attack in Ottawa stuns Canada16:11