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William Devane
William Joseph Devane (born September 5, 1939) is an American actor. He is known for his role as Greg Sumner on the primetime soap opera Knots Landing (1983–1993) and as James Heller on the Fox serial dramas 24 (2001–2010) and 24: Live Another Day (2014). He is also known for his work in films such as Family Plot (1976), Marathon Man (1976), Rolling Thunder (1977), Payback (1999), and Space Cowboys (2000).
Source: Wikipedia