Categories Articles Investigators believe Las Vegas gunman had severe undiagnosed mental illness: Sources Post author By crystalg Post date October 8, 2017 ABC News: Top Stories Tags Believe, Gunman, Illness, Investigators, Mental, Severe, Sources, undiagnosed, Vegas ← Inside The $1800/Month Studio Of This R29 Staffer → Nelly’s Accuser Claims Rape Without Condom, His Lawyer Says He Has Proof She’s a Liar