Question: Why did Kwa Geok Choo's husband die?
Sentence (from "Kwa Geok Choo"): Kwa Geok Choo (21 December 1920 – 2 October 2010) was a Singaporean lawyer and the wife of Lee Kuan Yew, the first Prime Minister of Singapore, and the mother of Lee Hsien Loong, the third and current Prime Minister.
Relevant evidence: Yes