Catherine Walker, who played Alice O'Brien in Irish series The Clinic, has been cast in new Sky TV medical drama, Critical.

Dublin-born Walker, who also appeared in spy series Strike Back and recently played Stella Kowalski in a Gate Theatre production of A Streetcar Named Desire, will play trauma registrar Fiona Lomas in the 13-part series which is set in a state-of-the-art Major Trauma Centre and which will focus on a different story during each episode.

Joining her will be In The Line of Duty actor Lennie James, Outnumbered's Claire Skinner, and Fresh Meat star Kimberley Nixon.