Sherlock star Benedict Cumberbatch has replaced Australian actor Guy Pearce in Johnny Depp's Whitey Bulger biopic.

Pearce was billed to play the Massachusetts gangster's brother Bill in the film, Black Mass, but unexpectedly quit the project last month (Apr14).

Cumberbatch and The Secret Life of Walter Mitty star Adam Scott have been added to the cast of the movie, which is based on the book Black Mass: Whitey Bulger, the Fbi, and a Devil's Deal.

Director Scott Cooper has started filming in Boston.

Joel Edgerton, Dakota Johnson and Juno Temple are also part of the all-star cast.