BENICIA, Calif. (KRON) — A contractor died while working at Valero’s Benicia refinery on Friday night, according to the company.

The Solano coroner’s office identified the employee as 35-year-old Luis Gutierrez of Wilmington, CA.

In a statement, Valero said the worker died around 10:30 p.m.

“Our thoughts and prayers are with the contractor and their family during this time of loss,” the company said.

Investigators are now determining whether the cause of death was work-related. No other information was immediately available.

An autopsy is scheduled for Monday.

CalOSHA and other agencies are working on the investigation as well.