Question: What is the date of death of Susan Buchan, Baroness Tweedsmuir's husband?
Sentence (from "John Buchan"): John Buchan, 1st Baron Tweedsmuir, (26 August 1875 – 11 February 1940) was a Scottish novelist, historian, and Unionist politician who served as Governor General of Canada, the 15th since Canadian Confederation.
Relevant evidence: Yes