He played Axel von Fersen in Sofia Coppola 's film `` Marie Antoinette '' , Sheriff Graham Humbert in the ABC series `` Once Upon a Time '' and serial killer Paul Spector in the BBC Two crime drama series `` The Fall '' .
He played Axel von Fersen in Sofia Coppola 's movie `` Marie Antoinette '' , Sheriff Graham Humbert in the ABC series `` Once Upon a Time '' and serial killer Paul Spector in the BBC Two crime drama series `` The Fall '' .