Mary Fletcher was one of twelve people killed by a boiler explosion at Upper Aspley Mill on the afternoon of 23 November 1857.
She was born in Bury, the daughter of block printer James Fletcher and his wife Alice.
By the time of the 1851 Census, the family was living on Colne Terrace, Aspley.
Mary was killed when the boiler at Upper Aspley Mill exploded at around 2:10pm on 23 November 1857, demolishing part of the mill. Her body was recovered from the mill goit by police officer W. Redfearn.