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Rolling Stone critic Pete Travers has backed calls for the late actor to pick up the first posthumous Academy Award since Peter Finch won for Network in 1976.
Ledger also has the support of Academy member and Dark Knight co-star Sir Michael Caine, who said he had earned a best supporting actor nomination at least.
The Sydney Morning Herald quotes him as saying: "I was stunned by his performance. I was absolutely stunned by it."
The Brokeback Mountain star died of an accidental overdose of prescription drugs in January, aged 28.
The 81st Academy Awards will take place on February 22.
> Ledger was first choice for Joker role.
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