A Waupun man was killed in a one vehicle rollover crash in Fond du Lac County. The crash happened shortly after 6am Thursday on STH 49 north of Harmsen Rd in the Town of Alto. Evidence at the scene indicated a southbound vehicle traveling on STH 49, left the roadway and rolled over ejecting a 24 yr. old Waupun man who was operating the vehicle. The subject was pronounced dead at the scene. The operator was not wearing his seat. The cause of the crash is still under investigation by the Fond du Lac County Sheriff’s Office. The Fond du Lac County Sheriff’s Office was assisted at scene by the Waupun Police Department, Life Star Ambulance and the Alto Fire Department.