 The U.S. Secret Service says the shooter is dead, along with one spectator. Two spectators are in critical condition. They add that the shooter fired multiple shots at the stage from an elevated position. And NBC News reports authorities know the name of the shooter. The alleged shooter had his wallet and I.D. on his person when he was killed. Investigative reporter Tom Winter says the FBI is now pouring through the man's background. Winter adds that they will not release the name until they know more about him and determine whether he was working alone.