PHNOM PENH, Cambodia — Nuon Chea, the most senior surviving member of the Khmer Rouge, who was convicted of genocide and crimes against humanity and sentenced to life in prison, died on Sunday in Cambodia. He was 93.

His death at Khmer Soviet Friendship Hospital, where he had been transferred for medical treatment on July 2, was confirmed by the tribunal that convicted him.

To the end, he asserted in a statement to the court the correctness and even the heroism of his role in the Khmer Rouge, the radical Communist movement that caused the deaths of two million people from 1975 to 1979 through execution, starvation and overwork.

Known as Brother No. 2 — he was second in command to the movement’s founder, Pol Pot, who died in 1998 — Mr. Nuon Chea was convicted of, among other crimes, directing the forced evacuation of perhaps two million people from the capital, Phnom Penh, and overseeing the torture and killing of more than 14,000 people in a notorious prison, Tuol Sleng.