One person was killed in a single vehicle rollover crash in Fond du Lac County over the weekend. Rescue personnel were called to the scene on Highway WH near Highway W in the town of Marshfield shortly before midnight Saturday. Sheriff’s sergeant Jim Borgen says the driver failed to negotiate a curve, the vehicle left the road and rolled over several times. The victim has been identified as Christopher Dugall. Investigators say speed and alcohol appear to be factors. The Mount Calvary ambulance and fire department assisted at the scene.