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Heath Ledger's grieving dad has said his son's death by accidental overdose would be an enduring agony for the family and should be a warning to others not to mix prescription drugs.

His comments came after the New York city medical examiner announced that the 28-year-old Brokeback Mountain star died from the effects of taking six types of painkillers and sedatives.

The Australian actor's body was found on January 22 in his Manhattan apartment.

He was filming scenes for The Imaginarium of Dr Parnassus at Battersea Power Station just before Christmas.

Ledger's premature death promoted outpourings of grief from New York to Hollywood, to his home town of Perth, in south-west Australia.

Family members returned home from the US this week and were reportedly planning a private funeral service.

His former girlfriend Michelle Williams and the couple's two-year-old daughter, Matilda, arrived to attend the ceremony, newspapers reported.

The West Australian newspaper said the family was hoping to hold a wake on Saturday at Cottesloe Beach, a resort village south of Perth that was a favourite spot of the actor's.

Kim Ledger, the actor's father, said in a statement that the family was humbled to be "among millions of people worldwide who may have suffered the tragic loss of a child".

"Few can understand the hollow, wrenching, and enduring agony parents silently suffer when a child predeceases them," he said.

He said the toxicology results should "put an end to speculation" about the cause of death.

Family members attended a memorial ceremony in Los Angeles last weekend, but the funeral arrangements have been kept a closely-guarded secret.

Among those reportedly due to attend are Ledger's Brokeback Mountain co-star Jake Gyllenhaal and a former girlfriend, Australian model Gemma Ward.

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