Richard Kadet, 67, of Redwood City died June 9 from injuries suffered in a May 29 bicycle accident on Woodside Road near the intersection with Northgate Drive, his family said.
Mr. Kadet was "an avid road biker for more than 35 years," relatives said.
He was unconscious when he was admitted to Stanford Hospital with a severe brain injury that required emergency surgery.
Mr. Kadet crashed about 12:30 p.m. while headed east on Woodside Road near the intersection with Northgate Drive in Woodside in what a witness said was a solo accident, according to the San Mateo County Sheriff's Office.
He was in the bike lane when his bike began to wobble and he fell over into the lane of traffic, the witness told deputies, adding that she had seen the accident through her rear view mirror.
The witness had traveled about 100 feet past Mr. Kadet, Lt. Ray Lunny told the Almanac. "She was shocked because the bicyclist appeared to be in control of his bike," he said.
Mr. Kadet was wearing a helmet, deputies said. He and his riding partner had a regular Sunday morning routine of a 25-mile-to-40-mile bike trip, deputies said.
The partner returned to the scene after discovering Mr. Kadet's absence when stopped at the Alameda de las Pulgas, deputies said.
Deputies are estimating Mr. Kadet's speed at the time of the accident as between 30 mph and 40 mph, deputies said.
Medics from the Woodside Fire Protection District treated Mr. Kadet at the scene and took him to the hospital.
More information will be posted as it becomes available.