John Dallas Mendenhall III, 46, Dies After Castro Valley Hit-and-Run Near Somerset and Anita Avenues
John Dallas Mendenhall III, 46, of Castro Valley, California, died after a white Chevrolet Tahoe struck them while they walked near Somerset and Anita avenues earlier in October 2026.
Officers tried to save Mendenhall, who died at the scene.
The Alameda County Coroner’s Office publicly identified Mendenhall on Thursday, October 15, 2026.
The California Highway Patrol’s Hayward office said the 63-year-old driver left the scene after the collision.
Investigators later located the vehicle and traced it to a Castro Valley address.
At about 3 p.m., officers arrested Timothy Dewitt on suspicion of leaving the scene of a collision resulting in death.
Authorities continue to investigate, and the allegation does not establish guilt.
Mendenhall’s death brings sorrow to the Castro Valley community and all who knew them.
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