Thompson, Mary M. "Muff", of O'Fallon, Missouri, died on Thursday, February 20, 2014 at the age of 92. Loving wife of the late Woodrow W. Thompson; beloved daughter of the late Lewis and Minnie Cupp; devoted mother of Shirley (Douglas) Dunlap and Robert (Cheryl) Thompson; cherished grandmother of Dana (Chris) Behymer and Melissa Thompson; dear aunt of Linda (Jack) King, Sandra (Harold) Schwartz, Cathie (James) Loesing, Rosemary (Ron) Lyons, Darlene (Bob) Douglas, and Charlette Carrington. She is preceded in death by her siblings Gene Cupp and Iris Shook. Mary was a member of the Corner Stone United Methodist Church for more than 50 years Memorials may be made to American Heart Association.