 The special agent in charge at the Pittsburgh FBI field office, Kevin Rojek, says it appears law enforcement did not know the shooter was on the roof until he began firing. It is surprising, but again, to get all the details of that will come out later in the investigation. The FBI named 20-year-old Thomas Matthew Crooks of Bethel Park, Pennsylvania, as the suspected shooter. Local prosecutors said Crooks and at least one attendee were killed.