Jason Momoa and Sarah Shahi Join the Cast of Walter Hills Untitled Next June 22, 2011 Two new additions of the cast of untitled Stallone/Hill thriller. Latino Review is reporting that Jason Momoa (‘Conan the Barbarian,’ ‘Game of Thrones’) has joined the cast of Walter Hill’s next, the action thriller formerly known as ‘Headshot,’ joining Sylvester Stallone and Sung Kang (‘Fast Five’). Based on the graphic novel ‘Bullet to the Head’ by Matz and Colin Wilson, Stallone plays a hitman who teams up with a New York City cop, possibly played by Kang, to take down the killers of their respective partners. Momoawill play, Keegan, the man responsible for the death of Stallone’s partner. In addition to Momoa, Variety reports that Sarah Shahi (‘I Don’t Know How She Does It,’ ‘Fairly Legal’) has joined the cast and will play the daughter of Stallone‘s character.