A 40-year-old man was arrested on suspicion of assault with a deadly weapon after a road rage incident that left a driver severely beaten.
Police said the April 16 incident was sparked after a cyclist and driver of a pickup truck got into an altercation. Officers received 911 calls around 5 p.m. reporting a body laying in the street in the area of East Blithedale and Camino Alto in Mill Valley.
Katie Zuppann saw the tail end of what police are calling an extreme case of road rage.
"It was pretty chaotic," Zuppann said. "It looked like the man had been hit by a car."
The man, who was covered in blood, turned out to be the truck driver.
Police arrested Jeffrey Smock in the alleged attack. His Facebook page describes him as an avid cyclist and athlete. Smock, who lives in Kentfield also reportedly founded tech company Iron Data Solutions.
Witnesses told NBC Bay Area they heard women screaming at Smock to stop the beating and telling him he was going to kill the man.
The driver was taken to a hospital with serious injuries was later released, police said. Smock is currently out of jail after posting bail.
Smock did not return NBC Bay Area's calls seeking comment.