ITV launches gripping true crime drama starring Colin Firth this weekend

NewsTVITVThe Staircase tells the story of Kathleen Peterson's death11:00, 25 Jul 2026ITV is launching a gripping drama starring Colin Firth this weekend. "The Staircase" originally premiered on HBO in 2022, but it is now airing on ITV and ITVX. The crime drama tells the true story of a writer, Matthew Peterson and his wife Kathleen, who was found dead at the bottom of a staircase.‌ITV's description of the series reads: "A wife lies dead at the foot of a staircase. Did she fall or was she pushed? Colin Firth and Toni Collette head an all-star cast in this gripping true crime story."‌A teaser for the series added: "When businesswoman Kathleen Peterson is found dead after reportedly falling down a flight of stairs at her North Carolina home, the unusually bloody scene leads police to focus th