Explanation:

- Jawaharlal Nehru: He was the first Prime Minister of India and a key leader during the independence movement. He was not assassinated; he died of natural causes in 1964.

- Mahatma Gandhi: He was a leader of the Indian independence movement against British rule. He was assassinated on January 30, 1948, by Nathuram Godse, a radical who opposed Gandhi's beliefs.

- Bal Gangadhar Tilak: A prominent freedom fighter known as "Lokmanya Tilak." He died of natural causes in 1920, not by assassination.

- Nana Sahib: He was a leader during the Indian Rebellion of 1857. His fate remains uncertain, but he was not officially known to have been assassinated.