While Nathaniel Brown's neighbors said they never imagined he was capable of opening fire on his co-workers, a man who used to work with him at a Columbus car dealership said otherwise on Tuesday.
The man, who asked not to be identified, said he feared Brown would do something violent years earlier, 10TV's Kevin Landers reported.
"He was the type of person that everyone in our dealership tried to stay away from," the man said.
He said Brown threatened to kill him and two others at the dealership before he was let go in 2004.
On Tuesday, after Brown was identified as the gunman who shot two employees at Ohio State, his former co-worker said he was not surprised.
"When I heard Nathaniel Brown, I looked over to my mother and said, 'He's finally killed someone,'" he said.
Records obtained by 10TV showed that Brown was sentenced to prison from 1979 to 1984 for receiving stolen property. He was hired as a custodian at Ohio State in October 2009.
It was not clear if Ohio State was required to conduct a criminal background check on Brown, but on his application for employment, Brown checked a box that said he had never been convicted of a felony, Landers reported.
Brown's former co-worker said he could not believe anyone would have hired him, given his past history.
"I'm surprised that anyone who ran a background check would not find a protection order and that he was actually terminated for threatening to take the life of co-worker," he said.
10TV asked Ohio State University officials if a criminal background check was completed before Brown's hiring. There was no response as of Wednesday morning.
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March 10, 2010:
Ohio State Shooting Victim Could Leave Hospital Today
March 9, 2010: Campus Alerts, Social Media Notified Students Of Shooting
March 9, 2010: Gunman Was Getting Fired From OSU Job
March 9, 2010: Ohio State Univ. Worker Shoots 2, Kills Self Inside Campus Building