A person working on the show "NCIS" died today after a man driving a passenger van for the production lost control and smashed into the set this morning.Law enforcement sources confirm ... the 60-year-old driver had some kind of medical emergency behind the wheel and veered on to the L.A. area set -- striking a 52-year-old male security guard. We're told the security guard was transported to a nearby hospital in critical condition -- but died from his injuries a short time later.
The accident is still under investigation.
