A 78-year-old Mountain View woman died Wednesday afternoon after the Toyota Camry she was driving collided with a tree on northbound Foothill Expressway, just south of Arastradero Road in Palo Alto, according to Palo Alto police and fire officials.
The woman's identity has not been released yet by the Santa Clara County Medical Examiner.
The cause of the 2:03 p.m. crash is unknown, police Lt. Sandra Brown said.
However, the woman might have suffered a medical problem that led to the accident, according to Battalion Chief Chris Woodard.
"There were no skid marks," he said.
Woodard said the woman was injured in the crash and was pronounced dead within about 10 minutes.
The Palo Alto Police Department's Special Traffic Accident Reconstruction team is investigating the collision.
Anyone with information or any witnesses to the collision are encouraged to contact the Palo Alto Police Department at 650-329-2413.