LOS ANGELES (TheWrap.com) – Screenwriter and director Frank Pierson, who won an Oscar for writing the 1975 film "Dog Day Afternoon," has died at the age of 87 in Los Angeles of natural causes following a brief illness, his family said Monday. Born May 12, 1925 in Chappaqua, New York, Pierson's earliest work included writing and directing on the classic television series "Have Gun, Will Travel" and "Route 66." He later branched out into film, writing or co-writing such notable films as "Cool Hand Luke," "Cat Ballou" and "Dog Day Afternoon. …