Allen, a Caltech mechanical engineering graduate (class of 2017), part-time teacher, and amateur video game developer, was a registered hotel guest and acted as a lone actor, according to authorities. Federal investigators searched his California residence and recovered a note sent to family members shortly before the attack. In it, he reportedly described himself as the “Friendly Federal Assassin” and expressed intent to target Trump administration officials. He has been charged with attempted assassination of the President, along with federal firearms violations, and pleaded not guilty.
