A new Ohio State University custodial employee who received a bad job evaluation shot two co-workers in a campus-maintenance building, killing one of them, and then fatally shot himself, officials said Tuesday.

Nathaniel Brown, who had been hired in October, arrived for work at the nation’s largest university in dark clothing with two handguns in a backpack, campus Police Chief Paul Denton said. Mr. Denton described the shooting as work-related, and said Mr. Brown recently received a poor performance evaluation, though he declined to say whether that was the motive. No students were hurt and classes went on as scheduled.

The shooting was first reported at 3:30 a.m. Tuesday. Mr. Brown, 51 years old, was pronounced dead at Ohio State University Medical Center several hours later, Mr. Denton said.

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.

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

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.