MENLO PARK — Police have identified a person of interest in a hit-and-run accident Thursday that killed a 6-year-old girl and injured her mother.

Investigators are looking for Shannon Fox, 24, of East Palo Alto, and want him to contact them regarding the crash, which occurred when a car involved in a street race ran a red light, said Menlo Park police Sgt. Matt Ortega. Fox has not been named a suspect, Ortega said.

On Friday, police learned that the girl whose parents' car was struck in the collision had died as a result of her injuries. Her father and her mother, both of Menlo Park, were also in the car, and the mother was in stable condition Friday with serious head trauma and broken bones, Ortega said.

The crash occurred at about 2 p.m. Thursday at Bayfront Expressway and Willow Road. As a Ford Mustang and a white compact car sped through the intersection southbound on Bayfront, the Mustang clipped a blue Toyota, spinning it around, according to witness accounts. The Mustang then hit the white car, and both spun out on opposite sides of the Bayfront median.

"They were racing," Kim Arrowood, a Sun Microsystems employee who saw the crash, said Thursday. "They had to have been going 70 mph."

The Mustang was wrecked, but it didn't stop the driver from getting away, Arrowood said. She said the Mustang's driver ran over to the white car, yelled "Let's go!" to that driver and hopped in. The two then turned around and drove

Ortega said video from the Sun campus confirmed that the two vehicles were involved in a street race. Police have both vehicles that were involved in the race in their possession, Ortega said. Fox is the owner of one of the cars, he said.

Police are asking anyone who knows Fox's whereabouts to contact them at 650-330-6300. Anyone who witnessed the crash is also asked to contact police.