Costello, Marie J. (Cassidy) age 87,of Canton, formerly of Neponset and Quincy passed away peacefully in the company of her loving family on Friday, October 6, 2017. The beloved wife of the late Paul A. Costello, she was the devoted mother of Maureen A. Costello – Shea and her husband Daniel of Raymond, NH, Paul J. Costello and his wife Barbara of Haverhill, Brian F. Costello and his wife Megan of Acton and Joan Marie Herrity and her husband John of Weymouth. Mrs. Costello was the cherished grandmother of Joanne Shea and husband Gavan Vogler, and Timothy Shea, all of NY, Kathryn Walker and husband Dustin of Washington, DC, Sarah Costello of Tampa, Kevin Costello of Haverhill, Emma, James and Shaun Costello of Acton and Julia Herrity of Weymouth. The sister of the late Eileen Sherrer Wilder, she was the dear aunt of Margaret Sherrer of Charleston, RI and cousin of James and Kitty Harlen of West Roxbury. Sr. Ann Brennan, SND of Dorchester was a lifelong close friend. A Funeral Mass will be celebrated at St. Ann Church, 251 Neponset Avenue, Neponset, Tuesday, October 10, 2017 at 10:30am. Visiting hours will be held at the Alfred D. Thomas Funeral Home, 326 Granite Ave., Milton, Monday, October 9, 2017, from 4 to 8pm. Burial in Cedar Grove Cemetery. A graduate of Katherine Gibbs Jr. College, Mrs. Costello retired in 1995 from her employment as an Administrative Assistant at Blue Cross/Blue Shield, North Quincy. She was a former member of the Philomethia Club of Boston College and St. Ann’s Women’s Guild. For many years she was actively involved in St. Ann Parish activities, the Boston Archdiocesan Choir School and the Girls Latin Parents League. Donations may be made in her memory Cornerstone at Canton Employee Appreciation Fund, 175 Revere St., Canton, MA 02021.