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Mr. Duyet endorsed Mr. McCain’s presidential bid in 2008 after insisting no Americans were tortured under his watch in the Vietnam War.

By Damien Cave

Reporting from Ho Chi Minh City, Vietnam

Tran Trong Duyet, the chief warden at Hoa Lo Prison, nicknamed the Hanoi Hilton, during the captivity of John McCain and other American pilots shot down during the Vietnam War, died Wednesday in Haiphong, Vietnam.