A 59-year-old Pittsburg man was killed in a solo car crash on Interstate 680 in Alamo late Sunday night, according to a Contra Costa County coroner's deputy.
Keith Allen Holster was driving a 1990 Nissan Axxess north on I-680 near the Stone Valley Road exit around 11:53 p.m. when he veered off of the roadway, down an embankment and into some trees, according to the California Highway Patrol.
He was pronounced dead at the scene.
Holster was the only person inside the car at the time of the crash, CHP Officer John Fransen said.
Investigators are looking into what caused the crash, Fransen said. Anyone who witnessed the crash or what led up to it is asked to call the CHP Contra Costa area office at 646-4980.