(MT. VERNON, IL) — The Jefferson County Coroner’s office has released the identity of a 64-year-old Mt. Vernon woman who was struck and killed by a semi Sunday while standing in the road on Interstate 57. Nancy M. Nulsen was pronounced dead at the scene Sunday on I-57 southbound near Mile Post 91, just south of Mt. Vernon in Jefferson County. The semi driver, 45-year-old David W. Northey, of Arizona contacted authorities at 5:31 a.m. Sunday saying he believed he had hit a person that was standing in the middle of the interstate. According to the Illinois State Police, Nulsen was walking in the lane of traffic when she was struck by the semi. ISP, Jefferson County Sheriff’s deputies, Jefferson Fire Protection District and the Illinois Department of Transportation, all responded to the scene. The investigation is ongoing and no charges have been announced.