Following the sad news of the untimely death of Australian actor Heath Ledger, it is unclear whether we will ever see his final screen performance.

He had a leading role in Terry Gilliam's new film, The Imaginarium of Doctor Parnassus, a fantasy adventure about a travelling theatre group, also starring Christopher Plummer, Tom Waits and supermodel Lily Cole.

Ledger had been filming in London up to last weekend.

Ledger will be seen as the Joker in The Dark Knight, the new Batman film, which is still scheduled for release in July as planned.