Source: Per news clipping post by David Archer at 18th Battalion Facebook Page (not group).
Family Search: Private William Otton Whiteside was born on 9 May 1897, in Bradford, West Gwillimbury, Simcoe, Ontario, Canada as the son of Allen Otton Whiteside and Eleanor Palmer. He had at least 2 sons and 1 daughter with Clementina Mary Harte Champion. He lived in Toronto, Ontario, Canada in 1916 and Toronto, York, Ontario, Canada in 1934. He registered for military service in 1916. In 1934, at the age of 37, his occupation is listed as clerk, custom house in Toronto, York, Ontario, Canada. He died on 26 May 1934, in East York, Toronto, Ontario, Canada, at the age of 37, and was buried in St John’s Norway Cemetery, Toronto, Ontario, Canada
Military Medal: 24 January 1919
History of the 18th Battalion CEF, "The Fighting Eighteenth" 