At 7:51 p.m. Sunday, officers from the Contra Costa CHP office were notified of a car versus pedestrian collision on I-680 southbound, north of Marina Vista.
Investigators said a man walking in the southbound lanes of the freeway was struck by a Toyota sedan whose driver was not able to stop in time.
Officers located the victim and he was pronounced deceased at the scene. Investigators said the driver and several passengers in the Toyota at the time of the crash were not injured and remained on the scene, cooperating fully with police.
Traffic on I680 was slowed to a standstill as the CHP conducted their investigation. Anyone witnessing the collision or the events leading up to it were asked to contact Contra Costa CHP in Martinez, (925) 646-4980.