A 21-year-old Rapid City man has died after a mountain biking accident in South Dakota's Black Hills.
Pennington County Sheriff's Sgt. Greg Foster says the man had been riding with a friend near Rockerville Saturday afternoon. Foster says the man was going down a steep hill when he hit a small rock in the trail, lost control of his bike and hit a tree.
The man suffered a serious head injury.
Foster says the man was reported to be a very experienced rider and was wearing a helmet.
The man's name was not released pending notification of his family.
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