Marilyn E. Costello, 83, of Concord, formerly of Scarsdale, NY, died Saturday, May 25, 2013 at Life Care of Acton. Born in Boston on June 1, 1929 she was the daughter of the late Thomas H. and Marion E. (Fitzgerald) Costello and attended schools in Scarsdale, New York. For many years, prior to her retirement, Miss Costello worked as a Real Estate Broker at Coldwell Banker in Concord. Previously, she was a General Manager for Clean Industry in East Boston and worked for several other privately held companies in Massachusetts and New York. During her early years, she was a businesswoman at NBC in New York City. A Concord resident for forty years, she was a Communicant of Holy Family Parish in Concord. She enjoyed her terriers and spending time at her summer home in South Yarmouth. Survivors include two close friends, Barbara Eisenzopf of Fitchburg and Leona Bianchi of Scottsdale, Arizona. Cemetery: Burial will follow the Mass in the family burial plot in St. Bernard's Cemetery, Concord. Visitation: Visiting hours will be held on Wednesday, May 29th from 9:15 AM to 11:15 AM in the Dee Funeral Home, 27 Bedford Street, Concord Center followed by a funeral Mass in Holy Family Parish, Monument Square, Concord at 11:30 AM. Service: Funeral Mass in Holy Family Parish, Monument Square, Concord, will be held on Wednesday, May 29th at 11:30 AM.