 Forced by ill-health to leave China for the US, Olyphant died "en route" in Cairo, Egypt, on June10, 1851.Olyphant's son Robert Morrison Olyphant joined his father at Olyphant & Co. and was later progressively Assistant President, Vice-President, and for twenty years President of the Delaware and Hudson Canal Company (later the Delaware and Hudson Railway).His great-great-great-grandson is actor Timothy Olyphant.