"I sat around in a hotel room in London for about a month, locked myself away, formed a little diary and experimented with voices — it was important to try to find a somewhat iconic voice and laugh. I ended up landing more in the realm of a psychopath — someone with very little to no conscience towards his acts … just an absolute sociopath, a cold-blooded, mass-murdering clown .... free rein fun, because there are no real boundaries to what The Joker would say or do. Nothing intimidates him, and everything is a big joke."

“All of this is so insignificant. In the grand scale of things, there have been so many before who have been in this position. I'm just another one. Life is so short. It's like we're already gone, really, in retrospect.”

“Working with Heath was one of the purest joys of my life. He brought to the role of Ennis more than any of us could have imagined - a thirst for life, for love, and for truth, and a vulnerability that made everyone who knew him love him. His death is heartbreaking.”

“Once every 50 years a guy like that comes along. For his age, Heath has an incredible manliness about him. I think he has a strong sense of himself, but it's especially amazing in someone so young, because usually male stars don't develop that kind of thing until their thirties.”

“It is tragic that we have lost one of our nation's finest actors in the prime of his life. Heath Ledger's diverse and challenging roles will be remembered as some of the great performances by an Australian actor.”

“Heath Ledger at BBC In Pictures.”

“We tested a lot of people and when Heath came along, he had the same manly qualities Mel Gibson had as a young man. They're never really boys; they already have it”