LOS ANGELES (AP) – The University of Southern California’s police department says the fatal stabbing of a professor on campus is not a random act of violence.

The USC Department of Public Safety says in a statement that investigators believe the Friday afternoon stabbing “was the result of a personal dispute” and that there was no threat to the campus.

Los Angeles Police Officer Meghan Aguilar says the suspect arrested in the death of the professor is a male student.

The president of the University of Southern California has identified the professor as Bosco Tjan, an expert in vision cognition and perception.

Chris Purington, project manager at Tjan’s lab, says he doesn’t know of any problems Tjan was having with a student and was shocked by his mentor’s killing. He says Tjan was a married father of one son.

The 10-story science building is in the heart of campus near the school’s running track.