A motorcyclist who died in a collision with another vehicle on Clayton Road in Concord on Friday morning has been identified by the Contra Costa County coroner’s office as 20-year-old Michael Hopfner.

Hopfner, a Concord resident, was heading west on Clayton Road shortly after 7 a.m. when he collided with a car at the intersection of Heather Drive.

He was taken to John Muir Medical Center in Walnut Creek and succumbed to his injuries there, police said.

The 46-year-old Pittsburg man driving the other vehicle remained at the scene after the collision and cooperated with investigators. Impairment doesn’t appear to be a factor in the collision, according to police.

Anyone who may have seen the crash is asked to contact Officer Katan Nanthasiri at (925) 671-5096.

strongCORRECTION/strong An earlier version of this story inaccurately identified the motorcyclist as David Hopfner, 18. SFBay regrets the error.

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