Producers working on Heath Ledger's final film have vowed not to alter the late star's last performance, even though the actor never got the chance to complete the project before his untimely death.

Work on The Imaginarium Of Doctor Parnassus resumed on Monday after the Brokeback Mountain star's death halted filming on the project earlier this year.

In his honor, Hollywood superstars Johnny Depp, Colin Farrell and Jude Law have signed up to feature in the film, which is due for release next year.

However, the film's director Terry Gilliam and its producers have promised to preserve every detail of Ledger's final performance, and that the hiring of the three new stars will not affect his work.

A statement released by the movie's producers reads, "Since the format of the story allows for the preservation of his entire performance, at no point will Heath's work be modified or altered through the use of digital technology.

"Each of the parts played by Johnny, Colin and Jude is representative of the many aspects of the character that Heath was playing."

Gilliam adds, "I am delighted that Heath's brilliant performance can be shared with the world.

"We are looking forward to finishing the movie and, through the film, with a modicum of humility, being able to touch people's hearts and souls as Heath was able to do."

Ledger had just finished shooting scenes for the fantasy movie in London just days before he was found dead in his New York apartment in January.

Toxicology results released last month revealed Ledger was killed by an accidental overdose of prescribed medications.

(This news article provided by World Entertainment News Network)