They were buried on Ocotber 11, 1799 in Kingston, Ontario[1][2]. A church was built over the grave.
Sources
↑ Find a Grave, database and images (https://www.findagrave.com/memorial/173934215/j-d-mckay: accessed 13 August 2022), memorial page for J D McKay (unknown–Oct 1799), Find A Grave: Memorial #173934215, citing St. Paul's Anglican Churchyard, Kingston, Frontenac County, Ontario, Canada; Maintained by MacPherson (contributor 46843275).