Barker continued to suffer from the physical effects of his 1918 gunshot wounds: his legs were permanently damaged and he suffered severely limited movement in his left arm. He also struggled with alcoholism in the last few years of his life. He died in 1930 when he lost control of his Fairchild KR-21 biplane trainer during a demonstration flight for the RCAF, at Air Station Rockcliffe, near Ottawa, Ontario. Barker, aged 35, was at the time the President and general manager of Fairchild Aircraft in Montreal.