ALBEMARLE COUNTY, Va. — John R. Potter, 50, of Charlottesville, died Saturday while riding a mountain bike on trails at Walnut Creek Park off Old Lynchburg Road in southern Albemarle County.

Potter was riding with a friend Saturday afternoon when he was killed, police said.

“The victim appears to have fallen from the bike and struck an object, believed to be a rock, which resulted in a traumatic and fatal injury,” Albemarle County Police Department spokeswoman Carter Johnson wrote in an email. “Both the victim and his friend were experienced mountain bikers. Both were wearing helmets.”

While the Albemarle County Police Department is investigating the crash, police said foul play was not suspected.