I know he died on Grindstone Island (present day Cap-aux-Meules?) on 22 Apr 1869,-before the 1870 census, but arrived after the 1860 census- and is buried in St. Luke's Church yard cemetery on Grindstone Island, Les-Iles-de-la-Magdalen, Quebec. His wife was Anne (nee Burke), had sons Samuel and William, daughter Mary, and he worked as a farmer, fisherman and customs official.
What I would like is a photo of his headstone, or at least a transcript- I NEED TO KNOW WHAT YEAR HE WAS BORN, AND WHERE!!! I'm pretty sure he was born in Ireland, between 1820 and 1840, but then again, so were several hundred other "John Mc Cormick"s of various spellings.