Located in De Smet, SD cementery, Ingalls died on June 8, 1902, of cardiovascular disease, at the age of 66. A Freemason, Ingalls was given Masonic rites at his funeral.[7] He is buried at De Smet Cemetery alongside his wife, Caroline, his daughters Mary, Carrie, and Grace, as well as his infant grandson who died at 12 days old, the child of daughter Laura and son-in-law Almanzo Wilder.