A Fond du lac woman who was killed in a one vehicle rollover crash in Fond du Lac County has been identified. The Fond du Lac County Sheriff’s Office says 45 year old Amber Ferrarelli was the driver of a minivan that overturned in a ditch on River Road Friday morning. She was pronounced dead at the scene. A passenger, Robyn Clark of North Fond du Lac, was not injured. The crash remains under investigation.