CHP Information Officer Steve Creel said the accident occurred around 12:30 a.m. just past the on-ramp to I-680 from Sycamore Valley Road. Creel said Michael Rose, 46, was driving a 1998 Toyota pick-up south on I-680 when he apparently lost control of the vehicle. The car struck the center median and overturned.
Creel said it was not readily apparent if Rose was ejected from the pickup truck or extricated himself following the accident but he was out of the truck when he and the vehicle were struck by other autos. A total of four other autos were involved. No other injuries were reported.
CHP arrived moments later as did emergency crews from the San Ramon Valley Fire Protection District. Rose was pronounced dead at the scene by officials with the Contra Costa County Coroner's office.
Creel said they are continuing to investigate the accident. He said they are trying to determine just why Rose lost control of the vehicle in the first place, and they are trying to piece together the sequence of events that followed the pick-up's collision.
"We have five vehicles out there and we're trying to put together who hit who," he explained.
Coroner's reports and toxicology tests will also help in the investigation. Creel said they should know more in the next few weeks.