Say died, apparently from typhoid fever, in New Harmony on 10 October 1834, when he was 47 years old.
* "American Conchology, or Descriptions of the Shells of North America Illustrated From Coloured Figures From Original Drawings Executed from Nature", Knjige 1 - 6, New Harmony, 1830-1834; Knjiga 7, Filadelfija, 1836.