Episode Detail: Prime Suspect 6: The Last Witness - Prime Suspect
Helen Mirren returns as Det. Supt. Jane Tennison, who is considering retirement when she takes a case involving the torture and murder of a young Serbian girl. Simon Finch: Ben Miles. Milan Lukic: Oleg Menshikov. Duscan Zigic: Velibor Topic. Arnold Tennison: Frank Finlay.