She is known for her roles in 12 Years a Slave, the Broadway play Eclipsed, Star Wars: The Force Awakens, The Jungle Book, Us, and Black Panther.
Walger married Davey Holmes, a producer, and screenwriter, in 2009.
She studied English literature at Oxford University.
The following year, Walger made her film debut in the biographical drama.
Recent roles include a supporting part as Michelle Dixon, the wife of Sarah Connor's former fiancé on Terminator: The Sarah Connor Chronicles.
She began her career on British television.