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A Southern California man has pleaded not guilty in the fatal stabbing of a co-worker on a college campus.

Online court records show Chuyen Vo of Huntington Beach on Friday pleaded not guilty to one count of murder in the death of 57-year-old Steven Chan.

Vo is due back in court on Nov. 22. Vo’s attorney Ed Welbourn had no comment.

Authorities say Vo stabbed Chan in a parking lot at California State University, Fullerton, in August. Chan retired from an administrative job at the college in 2017 but had returned this year to work as a consultant.

Police declined to discuss the relationship between the co-workers.