Thai died on October 10 at a nursing home in Encinitas, where he had been living for the past seven years, his daughter, Quynh Thai, told The Associated Press.
The eldest son of a merchant family in Vietnam's ancient port city of Hoi An, Thai went on to become a member of the Saigon press corps. He worked for The Associated Press in the 1950s and later for Time Life, covering his country's civil war, his daughter said.
He covered the simmering tensions in Saigon as the war escalated, including demonstrations by Buddhist monks and students. In 1963, he helped Time magazine open a bureau in Saigon, his family said.
US service members would frequent his photography studio in old Saigon to get their portraits taken to send home to family, and he would invite GIs to dine at his home and join his family on outings, his daughter Quynh Thai said.
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"I know that many other correspondents share this debt," he said in an email to Thai's family upon news of his death. Former Time correspondent Zalin Grant called Thai "extraordinarily brave" while cheerfully helping reporters.
Early in his career, Thai covered events for the French weekly, Paris Match. He was at the battle of Dien Bien Phu in 1954 and attended the subsequent Geneva Peace Accords, which ended French colonial rule in Vietnam, according to his family.