Mary T. (Keane) O'Brien, of Melrose & Saugus, passed away at home on Sept. 27, 2019 at the age of 91. Mary was born & raised in Newton and a graduate of Newton High School. She resided in Medford for 21 years and the past 45 years in Melrose. Mary worked as a Dietitian for the Malden Hospital & Forest Dale Nursing Home, both in Malden and Oosterman's Rest Home & the Normandy House, both in Melrose for many years. She also worked for the Malden Census and the Children's Exchange in Melrose. Mary was a longtime member of the Church of the Incarnation in Melrose and enjoyed cooking, sewing, and baking. She was caring & devoted to her family and friends and her grandchildren & great grandchildren were the most important part of her life. The O'Brien family would like to thank the Rubin House and staff for the wonderful and compassionate care they showed to Mary's during her illness. Mary was the beloved wife of the late Robert P. O'Brien for 61 years. Loving mother of Robert A. O'Brien & his wife Corinne of Wilmington, James P. O'Brien & his wife Janet of Lynnfield, Maureen T. Riley & her husband Edward of Saugus, Patricia E. Hughes & her husband Daniel of Melrose, Timothy M. O'Brien & his longtime companion Christine Cohane of Melrose and the late William J. O'Brien & his wife Julie of Ipswich. Cherished grandmother of Amy, Keith, Mark, Kristin, Robby, Talene, Gabrielle, Douglas, Patrick, Julianne, William and Jaclyn and the late Katelyn. Caring sister of the late Irene Kiley, Robert Keane and Carolyn Hart. Sister in law of Dorothy O'Brien of Tewksbury and Carol Keane of Natick. Also survived by 13 great grandchildren, nieces, nephews, relatives & friends. Visiting hours will be held at the Gately Funeral Home 79 W. Foster St. Melrose on Wednesday, Oct. 2, 2019 from 4-8PM. Procession from the Gately Funeral Home on Thursday, Oct. 3, 2019 at 8:45AM, followed by a Mass of Christian Burial at the Church of the Incarnation 425 Upham St., Melrose at 10AM. Relatives & friends respectfully invited. Burial in Wyoming Cemetery, Melrose. In lieu of flowers, contributions may be made in Mary's name to the Children's Hospital, P.O. Box 414421, Boston, MA 02241-4421.