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The friend, who was not identified in a press release from the U.S. Department of Justice, allegedly lied on federal firearms forms. A press conference detailing the charges will take place Monday afternoon.
Gunman Connor Betts, 24, was killed by law enforcement during the Aug. 4 shooting.
Betts allegedly showed signs of extreme misogyny before the shooting, officials briefed on the investigation told ABC News, and he had previously expressed suicidal thoughts and had a fascination with violence, his ex-girlfriend told ABC News.
Betts had never been charged with any sort of domestic violence despite allegations made by a former acquaintance who allegedly saw him choke a girl he was dating as a teen. Had he been charged, it would have prevented him from obtaining a gun.
Betts also allegedly made a “rape list” of female classmates he wanted to sexually assault as well as a “hit list” that was later found in a school bathroom.