At the end of Season 4 of Unforgotten DCI Cassie Stuart, played by Nicola Walker, tragically died in a car accident, sending shockwaves out to the other characters, actors, and viewers alike. But Sunny Khan is hit especially hard, given his close working relationship with Cassie. Sanjeev Bhaskar joins us to discuss how Sunny deals with this change, and what struggles and triumphs might lie ahead for his character this season.