Hannah Ware will play the female lead in Fox International's Agent 47, the in-development movie based on Square Enix's Hitman franchise.
Ware recently appeared in Oldboy and is also currently appearing in Betrayal on ABC.
The casting follows news that Rupert Friend will take the titular role, joined by Heroes and Star Trek star Zachary Quinto.
Plot details for the Aleksander Bach movie have yet to be revealed.
The in-development Hitman title for PlayStation 4, Xbox One and PC will see players taking control of "a globetrotting Agent 47 at the prime of his career".