by Kristen HarrisBuzzFeedBuzzFeed StaffAs a staff writer at BuzzFeed, I write about all things celeb and pop culture. Warning: This post mentions sexual assault, drug misuse, and depression. Plenty of celebrities hang up their proverbial Hollywood hats and retire of their own free will. Maybe they want to enjoy all the money they've made in peace or raise their kids in total privacy. Sometimes, however, something unexpected happens, leaving them feeling like they have no choice but to step away.