GENOA - A man was killed this morning when his semi-truck overturned in southwest Wisconsin.

Vernon County authorities said the rig rolled-over on Highway 35 near Genoa about 8:30 a-m. Traffic was reduced to one lane between the Dairyland co-op's power plant and the Genoa National Fish Hatchery.

Investigators are trying to determine the cause of the mishap. The trucker's name was not immediately released.