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French character actor Louis Mercier was in American films from 1929's Tiger Rose until well into the 1970s. Mercier was particularly busy at 20th Century-Fox's "B"-picture unit in the 1930s and 1940s, usually cast as detectives and magistrates. He can be seen fleetingly in Casablanca (1942) as a smuggler in the first "Rick's Café Americain" sequence. Louis Mercier's later credits include An Affair to Remember (1957, in which he was given a character name--a rarity for him), The Devil at 4 O'Clock (1961) and Darling Lili (1970).