She died 13 Dec 1757 in Westfield and is buried at the Old Burying Ground. 
↑ Massachusetts Births and Christenings, 1639-1915," database, FamilySearch : 9 February 2018), Mary Dewey, 28 Jan 1667; citing Northampton, Hampshire, Massachusetts, v 1 p 96; FHL microfilm 14,766.
↑ Massachusetts Marriages, 1695-1910," database, FamilySearch [ttps://familysearch.org/ark:/61903/1:1:FCMV-DLK] : 10 February 2018), David Ashly and Mary Dewey, 11 Jul 1688; citing reference ; FHL microfilm 186,162.
"The Life of George Dewey, rear admiral, U.S.N.; and Dewey family history : being an authentic historical and genealogical record of more than fifteen thousand persons in the United States by the name of Dewey, and their descendants : Life of Rear Admiral George Dewey" 
"Massachusetts Births and Christenings, 1639-1915," database, FamilySearch  : 10 February 2018), Mary in entry for Abigail Ashly, ; citing , ; FHL microfilm 185,469.
Westfield and its historic influences, 1669-1919; the life of an early town, with a survey of events in New England and bordering regions to which it was related in colonial and revolutionary times.
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It may be possible to confirm family relationships with Mary by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Mary: