Vallejo Man Charged With Three Counts of Manslaughter Following Triple Fatal DUI Collision in Napa County

William Dene Brumley of Vallejo faces manslaughter charges after a March 28 crash in Napa County killed three people on the Silverado Trail.

By: AXL Media

Published: Apr 2, 2026, 10:46 AM EDT

Source: Information for this report was sourced from East Bay Times

Fatal Consequences of a High-Impact Weekend Collision

The Napa County District Attorney’s office has officially moved forward with serious criminal charges following a devastating road accident that claimed three lives last Saturday. William Dene Brumley, a resident of Vallejo, was identified as the driver in a head-on collision that occurred on March 28 just outside the town of Yountville. According to the California Highway Patrol, the impact was severe enough to require an extensive emergency response and resulted in the immediate deaths of three individuals. Brumley now remains at the center of a legal firestorm as authorities piece together the events that led to the catastrophic failure of road safety.

Legal Framework of the Manslaughter Charges

Court records from the Napa County Superior Court indicate that Brumley is being held on three counts of gross vehicular manslaughter while intoxicated. Under California law, these charges imply that the defendant acted with more than ordinary negligence, exhibiting a total disregard for human life while operating a vehicle under the influence. The prosecution is also pursuing a fourth charge related to driving under the influence of drugs and causing injury, suggesting that narcotics, rather than alcohol, may have played a significant role in the driver's impaired state. This legal classification significantly increases the potential prison time Brumley faces if he is convicted on all counts.

Emergency Response on the Silverado Trail

The collision took place on the Silverado Trail, a major thoroughfare known for its scenic views and high traffic volume during the spring months. Video footage released by the California Highway Patrol shows the grim aftermath of the crash, with emergency crews working amid wreckage to clear the roadway and assist any survivors. The intensity of the head-on impact left little room for maneuverability, effectively shutting down the transit route for several hours as investigators documented the scene. Traffic safety experts often cite the Silverado Trail as a location requiring high driver alertness, making the allegations of drug impairment particularly troubling to local residents.