Known to have assissinated O'Dwyer, Udham Singh chose not to apologise to the British

Udham Singh (26 December 1899 – 31 July 1940), best known for assassinating Michael O'Dwyer, the former lieutenant governor of the Punjab in India, on 13 March 1940, done in revenge for the Jallianwala Bagh massacre in Amritsar in 1919, for which O'Dwyer was responsible, was subsequently tried and convicted of murder and hanged in July 1940.
While in custody, he used the name Ram Mohammad Singh Azad, which represents the three major religions of India and his anti-colonial sentiment. Writes a well-known analyst, "He too could have apologised. He chose the noose instead!"
Udham Singh's speech prior to sentencing in UK:

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“I say down with British Imperialism. You say India do not have peace. We have only slavery Generations of so called civilisation has brought us everything filthy and degenerating. known to the human race. All you have to do is read your own history. If you have any human decency about you, you should die with shame. The brutality and blood thirsty way in which the so called intellectuals who call themselves rulers of civilisation in the world are bastard blood . . ."

(At this point he was interrupted by the judge, but after some discussion he continued:)

"I do not care about sentence of death. It means nothing at all. I do not care about dying or anything. I do not worry about it at all. I am dying for a purpose.’ Thumping the rail of the dock, he exclaimed, ‘We are suffering from the British Empire.’ Udham Singh continued more quietly. ‘I am not afraid to die. I am proud to die, to have to free my native land and I hope that when I am gone, I hope that in my place will come thousands of my countrymen to drive you dirty dogs out; to free my country.

"I am standing before an English jury. I am in an English court. You people go to India and when you come back you are given a prize and put in the House of Commons. We come to England and we are sentenced to death.

"I never meant anything; but I will take it. I do not care anything about it, but when you dirty dogs come to India there comes a time when you will be cleaned out of India. All your British Imperialism will be smashed.

"Machine guns on the streets of India mow down thousands of poor women and children wherever your so-called flag of democracy and Christianity flies.

"Your conduct, your conduct – I am talking about the British government. I have nothing against the English people at all. I have more English friends living in England than I have in India. I have great sympathy with the workers of England. I am against the Imperialist Government.

"You people are suffering – workers. Everyone are suffering through these dirty dogs; these mad beasts. India is only slavery. Killing, mutilating and destroying – British Imperialism. People do not read about it in the papers. We know what is going on in India."

(At this point the judge refused to hear any more, but Singh continued:)

"You ask me what I have to say. I am saying it. Because you people are dirty. You do not want to hear from us what you are doing in India."

He then thrust his glasses back into his pocket, and exclaimed three words in Hindustani and then shouted:

'Down with British Imperialism! Down with British dirty dogs!"