Australian film star Heath Ledger has been found dead of a suspected drug overdose in Manhattan. He was 28. He became a star with 10 Things I Hate About You, which he followed with roles in The Patriot, A Knight's Tale, Monster's Ball, The Four Feathers remake, Ned Kelly and The Brothers Grimm. Yet it was his Oscar-nominated role in Brokeback Mountain that marked him out as a force to be reckoned with and even greater stardom appeared to beckon. His Joker in new Batman film The Dark Knight is now hotly anticipated as, tragically, his final role.