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DALLAS—Some believe the government is behind it. Others point to a cabal of business interests. A 72-year-old claims to have done it, though he admits he did not act alone. Or a figure known as “the cousin” may have played a role.
Yet years of denials, conspiracy theories and even grainy video have failed to reveal the perpetrators behind one of the most enduring mysteries in Dallas: Who creates the “X” on Elm Street in Dealey Plaza that supposedly marks the exact spot where President John F. Kennedy was fatally shot on Nov….