The cast of 'Once Upon a Time in Hollywood' has been steadily growing in recent months, with more and more big names being added to the fray.

However, one key role - that of Charles Manson - in Quentin Tarantino's latest film has thus far been unfilled, as the likes of Leonardo DiCaprio, Brad Pitt, Margot Robbie, Al Pacino, Kurt Russell and more have joined the cast.

And considering that the film centres around the Manson Family murders in 1969 Los Angeles, you would assume that Tarantino was waiting to land the right actor for the role.

Well, he seems to have done that now, as Australian actor Damon Herriman has been named as the cult leader.

Herriman has largely appeared in Australian films and TV series, although he has had small roles in the likes of 'J. Edgar' and crime mini-series 'Flesh and Bone' in recent years. He is best known for playing Dewey Crowe in 'Justified'.