 Others wounded. Authorities shot and killed the gunman who was situated on a rooftop outside the venue in the city of Butler, north of Pittsburgh. The Secret Service is investigating how the gunman with an AR-style rifle was able to make his way to that rooftop. Last night at the White House, President Biden called on Americans to reject political violence. A former president was shot, an American citizen killed, while simply exercising his freedom to support the candidate of his choosing.