Director Colin Trevorrow‘s script for Star Wars: Duel of the Fates, would have ultimately seen General Hux die on screen as well, but in the version of the script that leaked online, it’s revealed (via ScreenRant) that his method of death would have been self inflicted. In that version, Hux is no traitor. Instead, he finds himself realizing that defeat is inevitable, and so he goes to his room, to a display case which holds a variety of objects, including at least one vintage lightsaber, and he uses it to impale himself. Notably, the lightsaber he uses has a purple blade.
Article source: https://www.cinemablend.com/news/2546847/early-star-wars-9-script-had-a-much-different-ending-for-general-hux