The 20-year-old gunman who shot and injured former President Donald Trump, Thomas Matthew Crooks, appeared in an advertisement for BlackRock Inc., the company disclosed Sunday. “Crooks was one of several students who appeared in the background of the 2022 ad and was unpaid, BlackRock, the world’s largest money manager,” said in a statement to Bloomberg. “The ad was filmed at Bethel Park High School, where Crooks graduated in 2022, and featured a teacher, the company said.” The firm didn’t discuss the content of the ad but said footage would be made available to law enforcement and it “will be …