rdjcowboy.jpg Robert Downey Jr. has dropped out of Cowboys & Aliens so that he can pursue the Sherlock Holmes sequel!

According to a source for Entertainment Weekly, this is all due to a scheduling conflict. Though the sequel hasn't yet been greenlit by Warner Bros., it's being fast tracked and it looks like Robert would rather hop on that train, especially as the box office earnings for Sherlock are nearing the $300 million mark.

Warner Bros. commissioned a script for Sherlock in September and shooting is expected to start in June, which is when Cowboys & Aliens is set to begin principal photography. Cowboys producers aren't going to wait for RDJ, as they are currently looking to fill the role of protagonist Zeke Jackson.