 In an elevated position, he was on a rooftop adjacent to the venue, and those same law enforcement sources are telling ABC News he fired as many as eight rounds from an AR-15-style rifle. Those sources say the Secret Service killed the shooter. This person was sitting in the front row right in front of the former president minutes after 6 p.m. local time. He started speaking, and then we heard pound, pound, pop, pop, pop.