Mary Theres O'Brien
- Born: 16 May 1927, Bluffton, Winneshiek County, Iowa, United States
- Marriage (1): Roger James Fischer on 25 Aug 1951
- Died: 26 Dec 2016, Sigourney, Keokuk County, Iowa, United States at age 89
- Buried: Dec 2016, National Cemetery, Vining, Tama County, Iowa, United States
 Find A Grave ID: 174517998
Mary married Roger James Fischer, son of Alfred Hugo Fischer and Albina Agnes Kostlan, on 25 Aug 1951. (Roger James Fischer was born on 25 Aug 1926 in Clutier, Tama County, Iowa, United States, died on 29 Jul 2016 in Clutier, Tama County, Iowa, United States and was buried on 2 Aug 2016 in National Cemetery, Vining, Tama County, Iowa, United States.)
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