Catherine Lynne Sjoberg was last seen on June 5th, 1974 leaving Concord Center House from the Oconomowoc High School post-prom party during the early morning hours. The prom was held at the Jefferson County Concord House dance hall on Interstate 94 interchange in Concord, Wisconsin. According to a friend, Catherine stepped outside the Concord House around 3:00am for a breath of fresh air and never returned. Catherine is described as a white female with long and straight brown