The Fond du Lac County Sheriff’s Office is investigating whether a Fond du Lac woman may have suffered a medical condition prior to a rollover crash this week. Sixty four year old Dianne Majerus of Fond du Lac was pronounced dead at the scene on Highway K north of Highway 45 Thursday morning. Sheriff’s captain Ryan Waldschmidt says the road was not icy and there was no evidence of braking prior to the car entering the ditch. “Anytime you get a crash that looks like this, we still treat it as though its a traffic fatality until proven otherwise,” Waldschmidt told WFDL news. “…but its certainly possible she had a medical condition that caused her to go unconscious or lose control of the vehicle.”