On the 31st July, 1940, Udham Singh was hanged at Pentonville jail, London. On the 4th of June in the same year he had been arraigned before Mr. Justice Atkinson at the Central Criminal Court, the Old Bailey.
Udham Singh was charged with the murder of Sir Michael O’Dwyer, the former Lieutenant-Governor of the Punjab who had approved of the action of Brigadier-General R.E.H. Dyer at Jallianwala Bagh, Amritsar on April 13, 1919, which had resulted in the massacre of hundreds of men, women and children and left over 1,000 wounded during the course of a peaceful political meeting.
The assassination of O’Dwyer took place at the Caxton Hall, Westminster. The trial of Udham Singh lasted for two days, he was found guilty and was given the death sentence. On the 15th July, 1940, the Court of Criminal Appeal heard and dismissed the appeal of Udham Singh against the death sentence.
Prior to passing the sentence Mr. Justice Atkinson asked Udham Singh whether he had anything to say. Replying in the affirmative he began to read from prepared notes. The judge repeatedly interrupted Udham Singh and ordered the press not to report the statement. Both in Britain and India the government made strenuous efforts to ensure that the minimum publicity was given to the trial. Reuters were approached for this purpose.