Henry was born in 1839. He was the son of Stephen Mack and Hononegah Winnebago. He passed away in 1849. His memorial plaque says that he died on 30 Dec. 1839, Find a Grave says that it was 1 December 1840, and Barge (29) says that it was on 1 Dec. 1839.
He died in childhood and is buried with his parents at Macktown Forest Preserve, Rockton, Winnebago County, Illinois, USA. (Find a Grave)
Find A Grave, database and images (accessed 29 November 2019), memorial page for Henry Clay Mack (1 Dec 1840–1 Jan 1849), Find A Grave Memorial no. 43473632, citing Macktown Forest Preserve, Rockton, Winnebago County, Illinois, USA ; Maintained by Dean McMakin (contributor 46804161) .