PATTERSON (CBS13) — A San Jose man has died after crashing his motorcycle near Patterson over the weekend.

California Highway Patrol says, just after 11:30 a.m. Sunday, officers got a report of an accident on Del Puerto Canyon Road, west of Diablo Grande Parkway. As medics got to the scene, they found that a single motorcycle was involved.

The motorcycle rider was pronounced dead at the scene by medics, CHP says.

Investigators believe the rider was approaching a bend in the roadway when he, for an unknown reason, crossed over into the opposite lane and then crashed into a metal pole fence off the shoulder.

Officers say the rider was wearing a helmet at the time of the crash. Neither drugs nor alcohol appear to have been factors.

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The name of the rider has not been released at this point, but CHP says he was a 49-year-old man from San Jose.