 Heard before Justice McCardie in the Court of King’s Bench in London over five weeks, beginning on 30 April 1924, it was one of the longest civil law hearings in legal history.O'Dwyer saw the trial as a way of providing justifications for Dyer's actions at the Jallianwala Bagh massacre.O'Dwyer, aged 75, was shot dead at a joint meeting of the East India Association and the Central Asian Society (now Royal Society for Asian Affairs) in Caxton Hall in Westminster, London, on 13 March 1940, by an Indian activist, Udham Singh, in retaliation for the massacre in Amritsar.