Heath Ledger's father blames his son for his death.

Racing car driver Kim Ledger believes the late 'Brokeback Mountain' star - who died of an accidental overdose of prescription drugs in January 2008, aged just 28 - is accountable for his own passing because he was not carefully monitoring his medication.

He said: "We're all responsible for what goes into us and I blame Heath for not being responsible."

At the time of his death, it is believed the actor was mixing medication prescribed to him by three different doctors.

Heath's father also admitted the star's family - including the late actor's mother Sally, sister Kate and half-sister Olivia - had been affected by the news Michael Jackson had died from a suspected cardiac arrest possibly caused by an accidental prescription drug overdose.

Kim told Australia's Women's Day magazine: "On the day that Michael died I spoke to my daughters and former wife Sally and we all had such a down day."

Kim has offered his condolences to the late pop star's family - whose life was celebrated at a star-studded memorial service yesterday (07.07.09) - and admits he can empathise with what they are going through.

He said: "Heath and Michael were both very private and as the closest people to them, you want to protect that. We found ourselves asking each other, 'Would Heath have done it this way?' If not, then we weren't going to either.

"It's not for me to advise the Jackson family how to get through this, but what I will say is the saddest times are now, one-and-a-half years later. The media interest has died down, so I'm no longer surrounded by Heath and all I want to do is pick up the phone, but I can't."

Heath is survived by his young daughter, Matilda Rose - now aged three - with his former girlfriend, actress Michelle Williams.