Douglas Haig, 57, of Mesa, Arizona, became the first and only person arrested and charged in connection with the Oct. 1, 2017, massacre, which ended when the gunman, Stephen Paddock, killed himself. Haig told reporters following his arrest early last year that none of the surplus military ammunition he sold to Paddock in September 2017 was ever fired during the killing spree, which ranks as the deadliest mass shooting in modern U.S. history.
