Question: Who did the cast member of Rooster Cogburn play in True Grit?

Knowledge 1: Rooster Cogburn (film)
Rooster Cogburn is a 1975 American Western adventure film directed by Stuart Millar and starring John Wayne (in his penultimate film), reprising his role as U.S. Marshal Reuben J. "Rooster" Cogburn, and Katharine Hepburn. Written by Martha Hyer, based on the character Rooster Cogburn created by Charles McColl Portis in his 1968 western novel "True Grit", the film is about an aging one-eyed lawman whose badge was recently suspended for a string of routine arrests that ended in bloodshed. To earn back his badge, he is tasked with bringing down a ring of bank robbers that has hijacked a wagon shipment of nitroglycerin. He is helped by a spinster searching for her father's killer. "Rooster Cogburn" is a sequel to the 1969 film "True Grit". [SEP] Knowledge 2: True Grit (1969 film)
Frank Ross (John Pickard) is murdered by his hired hand, Tom Chaney (Jeff Corey). Ross's young daughter, Mattie (Kim Darby), travels to Fort Smith, Arkansas, where she hires aging U.S. Marshal Reuben ``Rooster ''J. Cogburn (John Wayne) to bring Chaney in, raising his fee by shrewdly horse trading with Colonel Stonehill (Strother Martin). Mattie has heard that Cogburn has`` true grit.'' She gives him a payment to track and capture Chaney, who has taken up with outlaw ``Lucky ''Ned Pepper (Robert Duvall) in Indian Territory (modern - day Oklahoma).
Knowledge 1: Rooster Cogburn (film)
Rooster Cogburn is a 1975 American Western adventure film directed by Stuart Millar and starring John Wayne (in his penultimate film), reprising his role as U.S. Marshal Reuben J. "Rooster" Cogburn, and Katharine Hepburn. Written by Martha Hyer, based on the character Rooster Cogburn created by Charles McColl Portis in his 1968 western novel "True Grit", the film is about an aging one-eyed lawman whose badge was recently suspended for a string of routine arrests that ended in bloodshed. To earn back his badge, he is tasked with bringing down a ring of bank robbers that has hijacked a wagon shipment of nitroglycerin. He is helped by a spinster searching for her father's killer. "Rooster Cogburn" is a sequel to the 1969 film "True Grit". [SEP] Knowledge 2: True Grit (2010 film)
True Grit is a 2010 American Revisionist Western film directed, written, produced, and edited by the Coen brothers and executively produced by Steven Spielberg. It is the second adaptation of Charles Portis' 1968 novel of the same name, which was previously released in 1969 starring John Wayne and Glen Campbell. This version stars Hailee Steinfeld as Mattie Ross and Jeff Bridges as Deputy U.S. Marshal Reuben J. "Rooster" Cogburn, along with Matt Damon, Josh Brolin, and Barry Pepper.
Knowledge 1: True Grit (2010 film)
True Grit is a 2010 American Revisionist Western film directed, written, produced, and edited by the Coen brothers and executively produced by Steven Spielberg. It is the second adaptation of Charles Portis' 1968 novel of the same name, which was previously released in 1969 starring John Wayne and Glen Campbell. This version stars Hailee Steinfeld as Mattie Ross and Jeff Bridges as Deputy U.S. Marshal Reuben J. "Rooster" Cogburn, along with Matt Damon, Josh Brolin, and Barry Pepper. [SEP] Knowledge 2: True Grit (1969 film)
Frank Ross (John Pickard) is murdered by his hired hand, Tom Chaney (Jeff Corey). Ross's young daughter, Mattie (Kim Darby), travels to Fort Smith, Arkansas, where she hires aging U.S. Marshal Reuben ``Rooster ''J. Cogburn (John Wayne) to bring Chaney in, raising his fee by shrewdly horse trading with Colonel Stonehill (Strother Martin). Mattie has heard that Cogburn has`` true grit.'' She gives him a payment to track and capture Chaney, who has taken up with outlaw ``Lucky ''Ned Pepper (Robert Duvall) in Indian Territory (modern - day Oklahoma).

Answer: U.S. Marshal Rooster Cogburn