- Lengthy grudge motivated Brown mass shooting, MIT professor killing: Sources ABC News
- Suspect in Brown and M.I.T. Killings Discussed Attacks in Videos, Officials Say The New York Times
- Brown University shooting suspect planned attack for a long time, offering no motive in video confession, officials say CNN
- Accused Brown University shooter planned attack for years, video transcripts show The Guardian
- Brown gunman cited grudge, expressed no remorse in videos, transcripts reveal WPRI.com