Mary Lou Knoll (nee Sampson) Tuesday, August 4, 2020. Beloved wife of the late James Robert Knoll; loving mother of Michael (Peter Jusich) Knoll, Robert (Samantha) Knoll, Daniel (Linda) Knoll, and the late Joseph Knoll; proud grandmother of Peyton Newman, Matthew Knoll, Erica Knoll, Max Newman, James Knoll, Henry Knoll, Tess Knoll; dear sister of James (Dorothy) Sampson; dear aunt, cousin and friend to many. Visitation at Bopp Chapel, Friday 9:00 am followed by 10:00 am service. Interment Jefferson Barracks National Cemetery.