Robert Downey Jr. won't ride into the Wild West after all.
The actor, who had been poised to reunite with "Iron Man" director Jon Favreau for the science-fiction western "Cowboys & Aliens," won't star in the film.
The movie, sources say, will still move forward with Favreau. But Downey has fallen off the project, and studio DreamWorks is seeking a new hero to replace him. Production is tentatively set to begin this year for a planned release in summer 2011.
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