Episode 5 Cassie and Sunny interview two of the suspects again and get closer to the truth of what happened to Walsh. Balcombe believes she may have found the cause of death. Details Casts Videos Galleries Posters Season Lists Title Episode 5 Genres Drama Crime Mystery Release Date 2021-03-22 Episode Runtime 00 Hours 46 Minutes Season Number 4 Episode Number 5 Production Companies Mainstreet Pictures Nicola Walker... DCI Cassie Stuart... Sanjeev Bhaskar... DS Sunil 'Sunny' Khan... Carolina Main... DC Fran Lingley... Jordan Long... DS Murray Boulting... Lewis Reeves... DC Jake Collier... Peter Egan... Martin... Sheila Hancock... Eileen Baildon... Susan Lynch... Liz Baildon... Phaldut Sharma... Ram Sidhu... Liz White... Fiona Grayson... Andy Nyman... Dean Barton... Clare Calbraith... Anna Sidhu... Lucy Speed... Marnie Barton... Alastair Mackenzie... John Bentley... Unforgotten | ITV (Trailer) Unforgotten | Series 1 | ITV (Trailer) Original Size (1280x720) Original Size (1920x1080) Original Size (3840x2160) Original Size (2560x1440) Original Size (1920x1080) Original Size (3840x2160) Original Size (3840x2160) Original Size (3840x2160) Original Size (1920x1080) Original Size (1920x1080) Original Size (1920x1080) Original Size (1920x1080) Original Size (3840x2160) Original Size (1920x1080) Original Size (1920x1080) Original Size (960x1440) Original Size (960x1440) Original Size (670x1005) Original Size (1000x1500) Original Size (680x1000) Original Size (1000x1500) Original Size (680x1000) Original Size (680x1000) Original Size (680x1000) Original Size (2000x3000) Original Size (1000x1500) Original Size (2000x3000) Original Size (720x1080) Original Size (1055x1500) Original Size (680x1000) Original Size (1333x2000) Season 1 6 Episode(s) 2015-10-08 Season 2 6 Episode(s) 2017-01-05 Season 3 6 Episode(s) 2018-07-15 Season 4 6 Episode(s) 2021-02-23 Season 5 6 Episode(s) 2023-02-27