One person received serious injuries following a Jet Ski accident at the Lake of the Ozarks over the weekend. 19 year old Joshua Cowell of Overland Park, Kansas was riding on the back of a 2006 Yamaha Jet Ski which was struck by a 2001 Sea Doo. Cowell was taken to lake regional hospital for treatment. The accident occurred Saturday night at the 8.5 mile marker of the big Niangua arm.