Kristopher C. Olson, 29, of Fenton was seriously injured May 1 in a motorcycle accident on Mill Hill Road near Well Street in Franklin County, the Missouri State Highway Patrol reported.
At 6:02 p.m., Olson was riding a 2006 Harley-Davidson east on Mill Hill Road, failed to negotiate a curve and began sliding before the bike ran off the right side of the road and struck a tree, the report said.
He was taken by ambulance to Mercy Hospital Washington.
Olson was wearing a helmet, the patrol reported.
The motorcycle was totaled, the report said.