A 23-year-old Tracy woman was killed Monday night when she was struck by a car on Interstate 580 in Livermore, the CHP reported.
The woman, identified by the Alameda County coroner's bureau as Michelle Fisher, was involved in a traffic accident on westbound I-580 just east of North Vasco Road around 11 p.m.
Fisher exited her crashed 2006 Toyota Corolla, which was blocking the highway's two left lanes, CHP Officer Steve Creel said.
As she stood near her car, a 2000 Lexus RX 300 driven by a 73-year-old woman hit the Toyota, causing it to spin, Creel said. The Toyota struck Fisher, causing fatal injuries, he said.
The CHP initially considered the case a hit-and-run, but CHP Officer Trent Cross said the 73-year-old driver later contacted authorities.
"The lady drove to a safe location and wasn't sure what she had hit," Cross said. "Once she observed the damage she called police."
Both the initial crash and the collision that killed Fisher remain under investigation, Creel said.