context: Rajiv Gandhi (Hindi गान्धी गान्धी), (August 20, 1944 - May 21, 1991), the eldest son of Indira and Firoz Gandhi, was the 6th Prime Minister of India (the third from the Gandhi - Nehru family). With the death of his mother on October 31, 1984, Rajiv was defeated in the general election on December 2, 1989 and served as prime minister until his resignation. Rajiv Gandhi is the youngest Prime Minister of India at the age of 40. He died in a human bomb attack by Sri Lankan Tamil militants (LTTE).
question: When did Rajiv Gandhi die?
answers.text: May 21, 1991