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My great uncle David Watson was born in Keady, County Armagh, Northern Ireland in 1858. He was living in East Finchley, North London betwen 1918 and 1923, including being a witness at my grandparents' wedding. However we can't find his death. There's one family memory that he died in Paris in the 1920s, possibly of a flu epidemic. How can I check this story? I haven't been able to find a searchable index of deaths in France (or at least in departements around Paris) for the 1920s, but presumably there is one?