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The investigation in the aftermath of a deadly crash at the Isabel Avenue off-ramp from Interstate 580 in Livermore on March 17, 2026. (Photo courtesy CHP-Dublin)

A Livermore man died after his car flipped out of control down an embankment at a freeway exit in his hometown late on St. Patrick’s Day, according to authorities.

The situation unfolded just before 8:45 p.m. Tuesday on westbound Interstate 580. The California Highway Patrol was called to the scene of a solo-vehicle crash at the Isabel Avenue-Highway 84 off-ramp, where a 2003 Audi A4 convertible overturned into the brush next to the freeway, according to Officer Tyler Hahn.

The initial investigation indicates that the driver of the Audi was speeding at 90 mph on the freeway that night, Hahn said.

“The Audi made an aggressive maneuver to pass a slower moving Honda. In doing so the driver of the Audi lost control and launched off the off-ramp over-turning down the south side embankment,” Hahn added. “Alcohol impairment is unknown currently and is pending further investigation.”

The decedent was identified as 45-year-old Livermore resident Jonathan Michael Walker, according to the Alameda County Coroner’s Bureau.

The driver of the Honda, who was not publicly identified, stopped at the scene and provided a witness statement to officers, Hahn said. The circumstances of the fatal crash remain under CHP investigation. 

The off-ramp was closed for more than three hours for the investigation and cleanup at the scene, according to Hahn. 

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Jeremy Walsh is the associate publisher and editorial director of Embarcadero Media Foundation's East Bay Division, including the Pleasanton Weekly, LivermoreVine.com and DanvilleSanRamon.com. He joined...

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