Some are child actors , others are former Hollywood heartthrobs . The most famous of them all is the late Heath Ledger who played a young version of himself in "The Dark Knight" and was killed by Joker at the end of that movie. Renée Zellweger caused controversy with her dramatically altered face .
Some are child actors , others are former Hollywood heartthrobs . Can be attributed to poor lifestyles , career lows , or shattered relationships . Renée Zellweger caused controversy with her dramatically altered face .