striking and killing the shooter. in the last few minutes, we've confirmed the identity of the gunman. what can you tell us about that? >> cnn can now confirm the identity of the gunman as keith thomas. his identity was confirmed by a federal law enforcement official as well as his sister. she said keith and another one of their siblings, a younger brother had been living on the street for a long time. she said the sibling took his life in 2009 and yesterday was that sibling's birthday. was that related to the shooting? unclear. that's a piece of information she shared with us. she last spoke to keith in november and does not believe this shooting was political. this information does mirror a little bit of what we've heard from the fbi. they described him as a franz current individual, who's had numerous run ins with the law, a criminal history. we heard from the attorney general here in texas, take a