updated 3/9/2010 4:11:03 PM ET 2010-03-09T21:11:03

Records showed that an Ohio State University janitor who fatally shot a supervisor and injured another was told last week he was being fired.

Documents released by the university from Nathaniel Brown's personnel file show that supervisors complained he was tardy, slept on the job and had problems following instructions.

Brown had been hired in October and was still on probation. The university sent him a letter March 2 informing him that his employment was to end Saturday.

Police said the 51-year-old Brown entered a campus maintenance building early Tuesday and shot two supervisors in an office suite. He was in dark clothing and carried two handguns in a backpack, campus Police Chief Paul Denton said.

Brown was found with a self-inflicted gunshot wound in a garage bay and died later at a hospital.

One of the victims, building services manager Larry Wallington, 48, died at the scene. The other victim, operations shift leader Henry Butler, 60, was in stable condition at Ohio University Medical Center, officials said.

No students were hurt and classes went on as scheduled.

More than a half-dozen employees were in the maintenance building when the shooting occurred and have been offered grief counseling, Denton said during a news conference.

"This is a tragic event, and our hearts go out to all of the families," said Vernon Baisden, a university assistant vice president of public safety.

Graduate student Kiernan Gordon, 31, said he found out about the shooting from his wife, who called him on his cell phone while he was driving to campus. He said he didn't have any concerns about his own safety.

"Ohio State is really a city unto itself, and like any city it has problems unto itself," Gordon said.

More than 55,000 students are enrolled at the university's main campus in Columbus.

The maintenance building where the shooting occurred is adjacent to a classroom building and a parking garage and is near Ohio Stadium, where the school's football team plays.

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