The murder of young Bruce Wayne's parents was filmed on Mother's Day, 2014.
Much of the film was filmed on location using guerilla style tactics without permits, excluding the alley shoot out.
The title reflects how young Bruce Wayne remembers the mysterious man who murdered his parents. It also combines both parallels Wayne's later alter ego with the lead character, Joe Chill, both men who reside in the shadows.
The fedora Salvatore Maroni (Phil Castro).wears was once owned by Eric Roberts, who played Maroni in The Dark Knight (2008).