Actor Matt Damon will quit playing assassin Jason Bourne after the third film is released this summer. Damon wants someone else to take on the role - created by author Robert Ludlum - and make it their own. Speaking at the Cannes Film Festival, Damon says, "I'm definitely done with that. I think we've ridden that horse as far as we can. "The character lives on in the books and if someone else wanted to play it it, I guess they could."