Los Angeles: A German documentary that probes Heath Ledger's death at a young age features a diary that the Australian actor created to prepare for his villainous turn as Joker in Christopher Nolan's 'The Dark Knight'.


Heath Ledger 

There are many theories about Heath Ledger's death at the age of 28 on January 22, 2008 due to prescription drug intoxication and some believe preparing for Joker may have contributed to his depression.