Covell of Somerville, formerly of Cambridge, May 26, 2012, Ruth T. (McElwain) Covell, age 86. Mother of Marie Fattibene of Medford, Donna Ferrari of Somerville, and the late Stephen and William Covell. Sister of Jean Connelly of RI and the late Dorothy Souza. Also survived by six loving grandchildren and four great grandchildren. A graveside service will be held in Cambridge Cemetery, Thursday, May 31, at 11:00 a.m. Relatives and friends invited.