A 75-year-old Oconomowoc man is dead and three others injured after a traffic crash on Highway 16 in Jefferson County. The sheriff’s office office says a car driven west by Alvin Wolter, near County F about 3:00 o’clock Tuesday afternoon crossed the center-line and hit an oncoming pick-up. Authorities say Wolter was killed and a passenger injured. The driver of the pick-up and a passenger were also injured. The crash is still under investigation. Investigators say everyone but Wolter was wearing a seatbelt.