HARRIGAN, Mary M. (Russo) of Cambridge. March 10, 2011. Beloved wife of the late Francis G. Harrigan. Loving mother of Michele Chaffe and her husband Dean of Spencer, Francis J. of Cambridge and Theresa Harrigan and her husband Ronald Grieger of Shrewsbury. Grandmother of Eleanor Jaspersohn and her husband Carl, Marian Chaffe, Scott and his wife Robina Grieger and Khara Grieger and her husband Martin Duparc. Great grandmother to Izabella, Gabriel, and Asia Marie Grieger. Sister of the late Nicholas Russo and Sr. Thomas Marie Shelley, O.P.. Funeral from the Keefe Funeral Home, 2175 Mass Ave., NORTH CAMBRIDGE on Tuesday at 9 am. Funeral Mass in St. John's Church, Cambridge at 10 am. Relatives and friends invited. Visiting hours Monday 4-7 pm. Burial in Cambridge Cemetery. In lieu of flowers donations may be made to Saint John the Evangelist Church, 2254 Mass Ave Cambridge MA 02140. For obituary, directions or to send an online condolence visit www.keefefuneralhome.com