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Mary C. (Walsh) O'Sullivan

June 5, 2022

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O’SULLIVAN, Mary C. (Walsh) of Dorchester, passed away peacefully surrounded by her family on June 5, 2022. Beloved wife of the late Cornelius C. “Connie” O’Sullivan.  Loving mother of Kevin and his wife Christine of Mansfield, James of Weymouth, Deirdre of Weymouth, Mark and his wife Jane of Southborough, and Brian and his wife Susan of Marshfield. Cherished grandmother of Michael, Meaghan, Katelyn, Matthew, Molly, Connor, Sarah, Jennifer, Brendan, and Mary. Adoring great grandmother of Addison, Bristol, Patrick, Luca, Charley, Amy, Evan, Zoe, and Noelle. Also survived by many loving cousins and friends.

She was married to Cornelius for 64 years and lived in Dorchester – Neponset

Throughout her life Mary held many jobs, other than Mother to her five children.

She was a beloved cook and waitress at the Pancake House at Boston Bowl, Dorchester.

She worked at the Phillips Candy house making hand made chocolates and of course Turtles. Her longest job was as a cashier at Osco Drug in Lower Mills for over 20 years, where she was fondly known as Mary Osco and made many lifelong friends.

Of her many other names, she was also known as Mary, Mame, Ma, Mom, Mommy, Nana and Great Nana.

Music was a major part of her life.  As a young, very talented singer she attended the Berklee Conservatory of Music in Boston. She sang with professional band leaders, sang on the Arthur Godfrey radio hour and in the downtown Boston music stores during the Holidays. Her best love of singing was always with her friends and family at functions and family parties. The karaoke machine was always on.

Although a music career was not out of the realm of possibility Mary met an Irish immigrant from County Cork, Ireland, married and begin a life of raising her family.
Throughout her life she  performed in shows and plays at St Ann’s school hall.  In Hello Dolly, South Pacific and many other shows – she played the lead roles. 
For over 50 years she was the soloist at St Ann’s Church in Neponset.  She was in the choir and sang weddings and funerals at the church. As a soloist she was ever known at Midnight Mass on Christmas. The song she sang that became her staple every year was Oh Holy Night. Singing was her passion and favorite thing to do.

Visiting hours in the John J. O’Connor & Son Funeral Home, 740 Adams St. (near Gallivan Blvd.) DORCHESTER, Friday from 4-8pm. Funeral Mass in St. Ann’s Church, NEPONSET, Saturday morning at 10 o’clock. Relatives and friends are respectfully invited. In lieu of flowers, please consider making a donation in memory of Mary to Southwood at Norwell Activity Center, Attn: Activity Center, 501 Cordwainer Dr., Norwell, MA 02061. Interment in Cedar Grove Cemetery. For directions and expressions of sympathy, please visit

To send flowers to the family, please visit our floral store.


June 10, 2022

4:00 PM to 8:00 PM
John J. O'Connor & Son Funeral Home
740 Adams Street
Dorchester, MA 02122

Funeral Mass
June 11, 2022

10:00 AM
St. Ann s Church, NEPONSET

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