Christopher Harper-Mercer, the gunman who shot nine people to death at an Oregon community college Thursday morning before killing himself, left behind a collection of predictably delusional notes in which he complained about not having a girlfriend, according to a law enforcement official who spoke with the Associated Press.

Police confirmed on Saturday that Christopher Harper-Mercer, the gunman who killed nine people at a community college in Oregon this week, died of a self-inflicted gunshot wound following a shootout with police officers.