Britain's revolving door of prime ministers just cost The Diplomat its best character

Austin Dennison is dead, and The Diplomat didn't even give him a death scene. Season 4 landed on Netflix on 15 October 2026, all eight episodes at once, and early in the run the Foreign Secretary played by David Gyasi is killed in a helicopter crash in Amritsar, India, along with the Indian prime minister. Viewers hear about it second-hand, when Prime Minister Nicol Trowbridge (Rory Kinnear) tells Vice President Hal Wyler (Rufus Sewell) in London. One conversation, and the most decent man in the series is gone.

A day later, creator Debora Cahn told TV Insider the decision "was not a happy revelation". The reason she gave is the most British thing about a very American show.

Five governments, one cabinet

The first two seasons were shot almost entirely in the UK, and Cahn watched Downing Street spin from the set. By her count, there were five different prime ministers while the crew was there, and her show had only had one. She spelled it out to Deadline:

"We reached a point where the Foreign Secretary and the Prime Minister, in our show, had been in office for the length of time that the actual UK had had five changes of government… and we had the same people all the way through, and it felt disingenuous not to make our characters face the challenge of the second you create relationships… the whole thing changes, and you're starting from scratch again."

— Debora Cahn, to Deadline

Fair enough. Liz Truss lasted 49 days. Trowbridge, meanwhile, survived the attack on HMS Courageous that killed 41 sailors, the Margaret Roylin affair and three seasons of Kate Wyler. In episode four Trowbridge announces that "His Majesty the King" has accepted his resignation, and Jodie Whittaker's Bethan Vaughan becomes only the second prime minister in the show's run. New Number 10, new Foreign Office, and Kate (Keri Russell) back at square one.

Read more: Three seasons rooting for Kate Wyler, and The Diplomat season 4 has fans calling her unbearable

The price of getting Westminster right

The Diplomat sells itself on plausibility. Cahn's consultants include Kim Darroch, the former UK ambassador to Washington, and her plots keep turning up in the papers a couple of years later. So the logic holds: real diplomats lose their contacts every time a government falls, and Kate should too.

The method, though, is pure telly. Westminster rarely kills its foreign secretaries. It reshuffles them, and they turn up a month later with a book deal. Cahn had a sacking, a lost election or a quiet move to the back benches available. She chose a helicopter in Punjab and a line of dialogue, for a character whose slow-burn almost-affair with Kate was the warmest thing on screen.

The Diplomat paid for realism with its most likeable character, and it paid off-screen.

Russell, to be fair, is on her boss's side. She told Deadline that losing Dennison is "monumental, but I also think realistic to these worlds."

Nobody in the cast is safe, and nor is the show

Cahn has called the realisation "terrible, terrible" in an interview with Entertainment Weekly, and admitted it still hurts. The finale piles on: Kate resigns in the middle of a G7 meeting and walks out, and Hal follows her.

Then there's Netflix. The Diplomat has been renewed early every time:

• Season 3: confirmed on 10 October 2024, three weeks before season 2 premiered.
• Season 4: ordered at Netflix's upfront in May 2025, five months before season 3 arrived.
• Season 5: nothing yet, with season 4 already streaming.

Fans in r/TheDiplomat are mostly optimistic. "They went from S3 to doing S4 very fast. I bet they're already working on S5 scripts," one wrote. Maybe. But Cahn spent four seasons arguing that in politics nobody keeps their job for long. Netflix hasn't yet said whether that includes her.

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