Diane Sullivan, 48, of San Francisco was involved in a collision with a cement truck traveling west on King Street across from the ballpark.
Police say the truck driver stopped immediately after the crash and is cooperating.
The woman was taken to a hospital with life-threatening injuries and was pronounced dead Saturday morning.
Investigators are attempting to determine how the crash happened. Alcohol and drugs do not appear to have been a factor, police said.
The fatal collision occurred as thousands of people waited to enter the San Francisco Giants Fan Fest.
Bay City News contributed to this story
