Source: We are the Dead. Note that headstone says 10th Battalion.
STAR BRINGS SAD NEWS
The Star brought the first news to the home of Pte. J.W. Kay, 272 Grace street, that he had been killed at the front. Pte. Kay Enlisted in Col. Barker’s battalion and went overseas at the end of May, 1916. He was 30 years of age, unmarried, and employed on the G.T.R.
Toronto Star – August 7th, 1917