A Blue Springs teen was killed and another seriously injured in a UTV accident southwest of Slater Monday afternoon. The State Highway Patrol says Sydnee Soendker lost control of the vehicle along Mariner Avenue at 270th Road around 1:45. It skidded off the road, hit a ditch, and overturned. She was pronounced dead at the scene about 20 minutes later. A passenger, 17-year-old Katelin Stiles of Blue Springs, was flown to Columbia with serious injuries.