Agnes died in 1915 in Jena, Jena, Thuringia, Germany aged ~73.
Sources
Find a Grave, database and images (https://www.findagrave.com/memorial/181530109/agnes-haeckel: accessed 24 February 2023), memorial page for Agnes Huschke Haeckel (1842–1915), Find a Grave Memorial ID 181530109, citing Alter Johannisfriedhof, Jena, Stadtkreis Jena, Thüringen, Germany; Maintained by Thomas Haas (contributor 48162931).
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