Los Angeles - Actor Heath Ledger won a posthumous Oscar Sunday as best-supporting actor.

Ledger, who died in January 2008 at age 28 from an accidental drug overdose, won for his widely acclaimed portrayal of the manic criminal the Joker in the Batman sequel The Dark Knight.

His award was accepted by his family, who received a standing ovation as they made their way to the stage.

"We'd like to thank the academy for recognizing our son's amazing work," said his father, Kim Ledger. "This award tonight would have humbly validated Heath's quiet determination to be truly accepted by you all here." (dpa)