He represented 2nd Queens in the Legislative Assembly of Prince Edward Island from 1876 to 1886 and 1890 to 1893 as a Conservative member.
He was born in New London, Prince Edward Island, the son of Donald McKay, a Scottish immigrant.
He was a justice of the peace, a commissioner for Small Debt Court and a member of the board of Railway Commissioners.
McKay died in Oyster Bed Bridge at the age of 58.
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