Stacy Keach joins The Bourne Legacy

Universal won't say who the actor will play

The Bourne Legacy has added Stacy Keach to its cast, but Universal Studios hasn't confirmed the actor's role or even his character's name.

The man best known for playing the lead role in the '80s television series The New Mike Hammer will appear in the latest film in the Bourne franchise.

This fourth outing is set in the same universe as the first three films, but will train its focus on a new character while Jason Bourne himself takes a breather.

Jeremy Renner plays the new film's lead, while Joan Allen and Albert Finney reprise their roles from previous Bourne movies. Edward Norton and Rachel Weisz also star.

The film is written and directed by Tony Gilroy, who wrote the previous three entries in the series.

The Bourne Legacy opens in UK cinemas on 17 August 2012.