The late actor Heath Ledger may have suffered from bipolar disorder, according to a new book.

The Brokeback Mountain star was found dead in his New York apartment in January from an accidental overdose of prescription drugs. Now a new biography of the star - entitled Heath: A Family's Tale - reveals his uncle Haydn suffers from the depressive condition, and suggests it might have run in the family.

Haydn tells author Janet Fife-Yeomans, "I don't mind people knowing I have bipolar disorder, and it's a shame that it took this long to be diagnosed."

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(This news article provided by World Entertainment News Network)