Initial reports revealed that executives were keen to postpone the movie's original September 7 release due to the recent Aurora cinema shootings, eyeing a January release.
The film, which stars Sean Penn, Josh Brolin, and Ryan Gosling as detectives in 1940s Los Angeles, contains a scene in which several men shoot into the audience of a cinema.
Trailers for the film ahead of The Dark Knight Rises were recently pulled out of sensitivity to the victims and their families.
According to The Hollywood Reporter, filmmakers are now planning to film reshoots in order to replace the scene, deemed too reminiscent of the recent shooting in Colorado which resulted in the death of twelve people.
Gangster Squad will now be released in cinemas on January 11, 2013.
Watch a trailer for Gangster Squad below: