George Roy Hill, the Oscar-winning director who helped turn Paul Newman and Robert Redford into one of Hollywood's most popular buddy combos with The Sting and Butch Cassidy and the Sundance Kid, died Friday at his home in New York City of complications from Parkinson's disease. He was 81. "He was the best friend that anyone could have: friend, mentor, enemy," Newman said. "He gave everyone a hell of a ride. Himself included."