Johnny Depp, Sienna Miller

Jon Kopaloff/FilmMagic/Mike Marsland/WireImage

Sienna Miller's role in Black Mass has landed on the cutting room floor. 

Director Scott Cooper told The Boston Globe that although the actress was "fantastic" alongside Johnny Depp and a slew of other A-listers appearing in the true-crime thriller, "narrative choices" drove her out of the film. 

Depp is completely unrecognizable as Whitey Bulger, a real-life Boston mobster who—after a 16-year manhunt—was sentenced to life in prison for a number of crimes, including 11 murders. Miller was slated to play a girlfriend of Bulger, but because his years as a man on the run with Miller's character were "less dramatic," her scenes did not make the final edit.

Johnny Depp, Black Mass

Warner Bros. Pictures

Last year, Miller opened up to The Boston Globe about the lengths she went to in preparation of the role. 

"The accent was something I really focused on because playing someone from Southie, you don't want to mess that up. Hopefully I've managed to pull that off, although I think everyone's like, 'How can you be English and think you can do that?'" she joked. 

But the Golden Globe-nominated actress chalked her appearance in the movie up to a "cameo," adding that during her two weeks on set, she had an "amazing time working with Johnny Depp, who I think is extraordinary and Scott Cooper, the director, who's made some amazing films as well."

Set to hit theaters Sept. 18, Black Mass also stars Benedict Cumberbatch, Kevin Bacon, Dakota Johnson, Joel Edgerton and Corey Stoll

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