Disillusioned with his place in Ren's regime, he supplied the Resistance with information about the Sith fleet on Exegol, determined to see his rival lose the war. Ultimately, however, Hux's role as a double agent was discovered by Pryde, and the young general was consequently executed for treason.

Is Hux really dead?

Though he appears to be First Order through and through, General Hux reveals himself to be the Resistance spy within the fascist regime when he saves Finn, Poe, and Chewbacca from execution. It's disappointing then, that he is executed shortly thereafter.

Did General Hux die in the last Jedi?

He helps Finn, Poe and Chewbacca escape Ren's Resurgent-class Star Destroyer Steadfast and has Finn shoot him in the leg so he can feign an effort to stop them. However, he is shot in the chest with a blaster by Pryde after the latter realizes Hux's treason through his cover story.