A single vehicle accident early Sunday morning near Winchester claimed the life of a rural Winnebago County man. Winnebago County authorities say a car driven by the 20 year old man was westbound on Grandview Road west of Larson around 2 a.m. The driver missed a curve, went off the roadway, and hit a tree, killing him. A 20 year old passenger was flown to ThedaCare Medical Center in Neenah in critical condition. Names have not been released, and the crash remains under investigation.