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John Dehner had a prolific career in both film and television, appearing in nearly 300 productions. He was known for his versatile acting skills and his ability to portray a wide range of characters, from villains to heroes. Dehner's most notable roles include the ruthless oil baron J.R. Ewing in the television series "Dallas" and the wise-cracking private investigator Harry Orwell in the film "The Maltese Falcon."