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The government’s most recent investigation into the assassination of John F. Kennedy began in 1994. The Oliver Stone movie “JFK” was still fresh in mind, and almost four in five Americans believed in a conspiracy to kill the 35th president.

The investigation, by the Assassination Records Review Board, was aimed at piercing the persistent secrecy that surrounded the crime. The board unearthed tens of thousands of records on the killing that had never been released.

Which makes its chairman, John R. Tunheim, among the most qualified people alive to talk about what happened Nov. 22, 1963. His conclusion: Lee Harvey Oswald did it — and no one else.

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