According to Wikipedia, "Heathcliff Andrew Ledger (April 4, 1979 – January 22, 2008) was an Academy Award-nominated Australian actor. After appearing in television roles during the 1990s, Ledger developed a Hollywood career. He starred in both critical and financial successes, including The Patriot, Monster's Ball and Brokeback Mountain, and completed the role of The Joker in the forthcoming The Dark Knight. Ledger died in New York City on January 22, 2008."

Here's the original trailer for Brokeback Mountain