Davis, Mary A. “Nonnie”(Marcotullio), of Somerville, Sept 2nd, 2013. Devoted wife of the late Edward L. Davis. Beloved mother of Carol O’Connor and her husband Joe. Cherished grandmother of Lisa O’connor and her friend Andrew Chernov, Christine O’Connor and her husband Sean. Dear great-grandmother of Madison O’Connor. Also survived by many other loving relatives and friends. Funeral from the Rogers Funeral Home, 380 Cambridge St., Cambridge Friday at 8 am. Funeral mass at St. Catherine’s Church in Somerville at 9 am. Visiting hours Thursday 4 to 8 pm.