Nicola Walker

Nicola Jane Walker is an English actress, known for her starring roles in various British television programmes from the 1990s onwards, including that of Ruth Evershed in the spy drama Spooks, DCI Cassie Stuart in Unforgotten (2015–2021) and Hannah Stern in The Split (2018–2024). She has also worked in theatre, radio and film. She won the 2013 Olivier Award for Best Supporting Actress for the play The Curious Incident of the Dog in the Night-Time and was twice nominated for the BAFTA TV Award for Best Supporting Actress for the BBC drama Last Tango in Halifax.