Question: What is the date of death of Mary O'Connell (1778–1836)'s husband?
Sentence (from "Daniel O'Connell"): Daniel O'Connell (6 August 1775 – 15 May 1847), often referred to as The Liberator or The Emancipator, was an Irish political leader in the first half of the 19th century.
Relevant evidence: Yes