Mary Agnes Sheehan was born on May 25th, 1908 in Bear River, Prince Edward Island. She attended school in the Bear River community and at St. Mary's Convent in Souris. She was forced to leave school in 1925 when her father passed away in order to help her mother operate the family farm.
In 1928 she married Hugh Sheehan of Bear River and he helped them operate the farm until her mother passed away later that year. After the death of her mother they closed the farm and moved to Waterville, Maine. However, the urge to farm soon pulled them back to Prince Edward Island where they reopened the family farm and raised 13 children there.
During her life she was a member of the St. Alexis Parish, and a firm believer in St. Ann de Beaupre. She made her first of 21 visits to the St. Ann de Beaupre shrine in Quebec in 1975.
Mary died on December 9th, 2000 at the age of 92. At the time of her death she was the oldest member of the Bear River community. She was predeceased by her husband Hugh, was the mother of 13 children, grandmother of 45 children, and great grandmother of 34 children. She was remembered as being very active in her community, and a member of the Bear River Women's Institute, Catholic Women's League, and was instrumental in organizing gatherings and benefits for Bear River community members.