True Grit is a 1969 American western film. It is the first film adaptation of Charles Portis' 1968 novel of the same name. The screenplay was written by Marguerite Roberts. The film was directed by Henry Hathaway and starred Kim Darby as Mattie Ross and John Wayne as U.S. Marshal Rooster Cogburn. Wayne won his only Academy Award for his performance in this film and reprised his role for the 1975 sequel Rooster Cogburn. Historians believe Cogburn was based on Deputy U.S. Marshal Heck Thomas, who brought in some of the toughest outlaws. The cast also features Glen Campbell, Robert Duvall, Dennis Hopper, Jeff Corey and Strother Martin. The title song, sung by Campbell, was also Oscar-nominated.