All BART trains are running on time after a medical emergency and investigation delayed service for more than an hour, BART officials said.
The medical emergency was reported at the Walnut Creek station late Tuesday night, an employee said.
Trains were delayed in the Pittsburg/Bay Point and SFO directions for more than 20 minutes, the employee said.
All service was restored around 1:05 a.m.
Nearby, a fatal crash was reported when a body was seen lying on the roadway of southbound Interstate Highway 680 in Walnut Creek, near the state Highway 24 interchange, according to the California Highway Patrol.
As of 1:10 a.m., all but the slow lane remained closed as the crash was investigated, Officer Peter Van Eckert said.
The pedestrian may have, at one point, been on the nearby BART train tracks at the Walnut Creek station before being fatally struck, Van Eckert said.
BART police is at the scene for the investigation, he said.
It is unknown if the two incidents are directly related.