Although the character's appearance in the film has not been confirmed, Crossbones, also known as Brock Rumlow, usually appears as a henchman of the Red Skull in the Marvel Comics universe. He is a highly trained mercenary, who carried out the assassination of Captain America. He was created by writer Mark Gruenwald and artist Kieron Dwyer in 1989.
Frank Grillo will next be seen in Ruben Fleischer's Gangster Squad and Kathryn Bigelow's Zero Dark Thirty.
Production is scheduled to begin early next year in Cleveland.
Captain America: The Winter Soldier was released April 4th, 2014 and stars Chris Evans, Samuel L. Jackson, Scarlett Johansson, Robert Redford, Sebastian Stan, Anthony Mackie, Cobie Smulders, Frank Grillo. The film is directed by Anthony Russo, Joe Russo, Joss Whedon.