Margaret Jeanne Ringer On Saturday, September 27, 2014, of Upper Marlboro, MD. Beloved mother of Robert B. Ringer, Jr. and William A. Ringer and his wife, Gloria; also survived by one grandchild. A Mass of Christian Burial will be celebrated at Mt. Calvary Catholic Church, 6700 Marlboro Pike, Forestville, MD on October 3, 2014 at 11:00am. Interment, Cedar Hill Cemetery, Suitland, MD.