 He also wrote no manifesto, left behind no indication about why he did it. Even after authorities gained access to his phone, they say they still have no clue about his motivations. All we're told is that for some reason, he obviously wanted Donald Trump dead. There's just a handful of videos of the shooter circulating, including one in which he makes some weird sexual joke, and one in which he appears briefly in a BlackRock video featuring his high school classroom.