Spoilers: ‘The Diplomat’ Season 4 kills Austin Dennison and ends with Kate Wyler’s resignation

Deadline reports that Austin Dennison dies in a helicopter crash and Jodie Whittaker’s Bethan Vaughan becomes British prime minister in Season 4. Keri Russell called Dennison’s loss “monumental,” while creator Debora Cahn said the political changes reflect the upheaval of diplomatic work. Gold Derby reports that Kate and Hal resign after President Grace Penn admits at a G7 summit that the U.S. stole a nuclear missile from a sunken Russian submarine.