— The man who shot two co-workers inside an Ohio State campus building before committing suicide on Tuesday morning learned last week that he was getting fired.
Nathaniel Brown was already struggling to keep his home from going into foreclosure, 10TV's Maureen Kocot reported.
Brown, 51, lost his job even as he was working his mortgage lender to keep his north side home on Grasmere Avenue. Although it was stress on top of stress, neighbors who described Brown as polite said that they were stunned.
SLIDESHOW: Images From Shooting Scene
According to neighbors, Brown was unemployed until October, when Ohio State put him on the maintenance payroll.
"He seemed to be a pretty good dude to me," said Hubert Brown, a neighbor. "He was happy to be back at work, so I don't know what went on. He snapped for some reason."
Nathaniel Brown served five years in prison in the 1970s and 1980s for receiving stolen property, according to the Ohio Department of Corrections.
According to a March 2 letter to Nathaniel Brown from Ohio State, his immediate supervisor rated his job performance "unsatisfactory" for reasons that included getting caught sleeping on the job.
The letter that was obtained by 10TV News continued with, "I regret to inform you that you are removed effective March 13."
Nathaniel Brown not only lost his job, but he was at risk of losing his home. He was working with his mortgage lender and a mediator to keep his house from going into foreclosure, Kocot reported.
No one may ever fully understand why Nathaniel Brown walked into the OSU Maintenance Building, armed with two handguns, and shot two people before he took his own life.
"Its surprising to me - for him - for that to go on like that because of the way he carried himself," said Archie Whittington, a neighbor.
Neighbors told Kocot that they saw Columbus SWAT officers at the home, likely to search for evidence that could help explain a motive behind the killings.
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Ohio State University main hall. 
An Ohio State University employee allegedly killed a co-worker before committing suicide on Tuesday morning. The suspect was Nathaniel Brown, a 51-year-old custodial worker who has worked at the University since October. The victim of the shooting was Larry Wallington, a 48-year-old building service manager. Another employee, Henry Butler, was also shot, but survived and is in stable condition at a nearby hospital.  

According to officials, the shooting took place at 3:30 A.M. local time. Brown is said to have walked into a maintenance building with two handguns, and then commenced firing.  Although police say that there were six men in the room at the time, only Wallington and Butler were shot. Within an hour of the shooting, a text message was sent out to about 25,000 students and faculty on campus alerting them of what had happened.  

Information gathered following the shooting has revealed that Brown was unemployed and struggling to pay his mortgage prior to his employment at Ohio State. Although a neighbor described him as "happy to be back at work," Brown's tenure at Ohio State ended quickly. Brown had learned from a recent letter from the school that he was going to be let go as of March 13. The letter went on to say that he had gotten an "unsatisfactory" job evaluation, and that was why he was being dismissed.