Thomas Matthew Crooks appeared briefly in a 2022 BlackRock Inc., ad about teachers’ retirement plans. He and other students in the background were not paid, BlackRock said.

The FBI identified Thomas Matthew Crooks as the man who shot at Donald Trump. Crooks was a 20-year-old from Bethel Park, Pa., and was shot dead by a Secret Service sniper.

At the time of his death, Crooks, who had shown a gift for engineering projects, had been working on homemade explosives.