Slow Horses Season 6 Finale River’s Cliffhanger Death, Explained

Slow Horses Season 6 ended on October 21, 2026, and Apple TV+ didn&#8217. t pull any punches. The finale left River Cartwright (Jack Lowden) seemingly dead. He collapsed after what looked like poisoning from residue on a crowbar he&#8217. d moved. It&#8217. s a brutal way to close out a season that already killed off Struan Loy, JK Coe, and Emma Flyte.

But this is Slow Horses. Deaths here are rarely what they seem. Season 7 is expected in autumn 2027 with filming starting next year, and Season 8 was already renewed back in September. Whether River&#8217. s apparent death sticks or turns out to be another misdirect is the question heading into next season.

Jackson Lamb (Gary Oldman) loses his sharpest operative if River&#8217. s really gone. If he&#8217. s not, the fallout from this finale will shape whatever comes next.

Read our full Slow Horses review and episode guide.

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