A one vehicle rollover crash in Fond du Lac County has claimed the life of a Campbellsport woman. The victim has been identified as 65 year old Margaret Weaver of Campbellsport. The crash happened shortly before 6:30pm Friday on state Highway 45 south of Mitchell Road. A preliminary investigation shows the vehicle was southbound on 45 when it failed to negotiate a curve, entered the ditch and overturned. Speed appears to be a factor in the crash.