The motorcyclist killed Sunday in a collision with a car on Highway 121 north of Vichy Avenue was identified Monday by the Napa County Coroner's Office as Brandon Shepard, 24, of Napa.
In an earlier report, the California Highway Patrol identified the fatality as a 24-year-old Merced man.
The CHP said the motorcyclist's Harley-Davidson crossed into the path of an on-coming Lincoln while rounding a curve at noon.
The motorcyclist was taken to Queen of the Valley Medical Center, where he was pronounced dead, CHP reported.
Jose Luis Mejia, 69, of St. Helena, who was driving the Lincoln, sustained a minor injury and was released from the scene without a charge or citation, CHP said.
The fatal crash shut down Highway 121 for about 45 minutes. The cause remains under investigation.