She passed away 11 Jul 1947 (aged 11),Ascension Parish Louisana, and is buried in Prairieville Cemetery, Prairieville, Ascension Parish, Louisiana, Plot: Row 26 Plot 16.
Sources
Find a Grave, database and images (https://www.findagrave.com/memorial/11429050/joan-ann-duplessis : accessed 26 August 2021), memorial page for Joan Ann Duplessis (9 Aug 1935–11 Jul 1947), Find a Grave Memorial ID 11429050, citing Prairieville Cemetery, Prairieville, Ascension Parish, Louisiana, USA ; Maintained by mtek77 (contributor 46578182) .
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DNA Connections
It may be possible to confirm family relationships with Joan by comparing test results with other carriers of her ancestors' 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 some percentage of DNA with Joan: