David, I thought this search had been done, but on checking, don't think it had.
William McHardy Duncan, aged 57 and a handyman by occupation died 1 Feb 1945 from pulmonary tuberculosis. He showed as married to Catherine Margaret Oliphant Shepperd. Living at 6 Crown Lane Aberdeen. As you had on the 1911 marriage, only mother Annie Duncan is showing for parent.
Monica