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Sidney Poitier, the star of Hollywood classics like Guess Who's Coming to Dinner and To Sir, With Love, has died at the age of 94.The actor came to fame at a time of racial segregation in the United States and went on to become the first black man to win a best actor Oscar.The BBC's Lizo Mzimba looks back on his film career.More on this story: Hollywood icon Sidney Poitier dies aged 94