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Which actor played Hercule Poirot in Sidney Lumet’s Murder on the Orient Express?

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Sidney Lumet in a tuxedo holds his Honorary Academy Award and smiles backstage at the 77th Annual Academy Awards, with a gold Oscar statue in the background. — Sidney Lumet American director Sidney Lumet after receiving an Academy Award for lifetime achievement, 2005.

In the 1974 film adaptation of Murder on the Orient Express, directed by Sidney Lumet, the role of the detective Hercule Poirot was played by the English actor Albert Finney.123