He was a member of a hospital board, the Edmonton Exhibition Board and the Masonic Order. He was affiliated with the Presbyterian Church and later the United Church of Canada, attending Robertson United Church in Edmonton, where he served as an elder. Politically, he aligned himself with the Conservative Party of Canada. In his free time he enjoyed the sports of baseball and football. He died at a hospital in Edmonton on June 9, 1947 at the age of 80, after an illness of two weeks. He was survived by his wife and children as well as a brother. He was later interred at the Edmonton Cemetery after his funeral held at Robertson United Church. His wife Jessie died in 1952 and was interred next to him. The Edmonton Historical Board states that Armstrong was remembered as " hardworking, fair and honest person who served our city well during a time of rapid change and growth".