GREEN VALLEY, Wis. (WFRV) - A 65-year-old woman died in a structure fire Thursday night in Marathon County, authorities confirmed. First responders were dispatched shortly before 10:45 p.m. to the 133700 block of County Road C in Green Valley. Deputies warn of open water on Shawano Lake, 2 incidents within past 24 hours The woman, a resident of the home, was pronounced dead at the scene. Investigators have determined the fire's cause to be non-suspicious, but the exact cause of death remains under investigation. Updates on the case are expected, and Local 5 News will provide more information as it becomes available.