Hall County Sheriff’s Office investigators are ruling the December death of a Gainesville man killed by a train in Oakwood as a suicide, authorities said. Shon Morrison, 40, of Gainesville, was killed Dec. 19 after being struck by a train in Oakwood near Main and Railroad streets. “The investigator did indicate to me that it would be ruled as a suicide after reviewing the train’s surveillance footage,” sheriff’s office spokeswoman Deputy Nicole Bailes wrote in an email.