Cotter, Mary M. (Mack) of Cambridge, July 4, 2018 at age 78. Devoted wife of the late Frank C. Cotter. Loving mother of Laurence Morong and his wife Maura. Cherished grandmother of Ryan and Rachael Morong. Beloved sister of Helen Farmer, James, John and Richard Mack. Former wife of the late Laurence O. Morong. Also survived by many nieces, nephews, other loving relatives and friends. Visiting hours at the Rogers Funeral Home, 380 Cambridge St., Cambridge on Sunday, July 8, 2018 from 1:00 to 4:00 pm with a prayer service to follow in the funeral home at 4:00 pm. Graveside service on Monday, July 9, 2018 at the Chestnut Hill Cemetery, 54 Bedford St., Burlington at 11:00 am, please meet at the main gate at 10:45 am.