Nationalist who shot Sir Michael O'Dwyer in 1940; 1899-1940
Udham Singh
An orphan raised at the Central Khalsa Orphanage in Amritsar, Udham Singh was at Jallianwala Bagh on 13 April 1919. In 1940 he shot Sir Michael O'Dwyer, governor of the Punjab at the time of the massacre, in London, and was hanged at Pentonville.
Early life
His birth name was Sher Singh, and he was born at Sunam on 26 December 1899. He was at the Bagh on the day of the firing, and left India soon after. He returned to the Punjab with revolvers, was jailed for four years under the Arms Act, and took the name Ram Muhammad Singh Azad to stand for the unity of India's communities.[EoS]
Caxton Hall
On 13 March 1940, at a meeting at Caxton Hall in London, he fired on O'Dwyer, who was killed, and wounded Lord Zetland. He was sentenced to death and hanged on 31 July 1940. His ashes were brought home in 1975.[EoS]
Images

Portrait of Udham Singh, credited on Commons to the Punjab State Archives. Its exact date has not been confirmed.
Unknown, Before 1940 if from life; not confirmed. Punjab State Archives (as credited on Commons). Public domain. Source