London, Aug 6 : The Jacksons have called for a third autopsy on the late King of Pop''''s body to try and discover evidence of ''''foul play'''', it has been reported.

Sources claim that the latest exam - the second private probe - will take place this week, reports The Sun.

Heartbroken Katherine Jackson insists that her son was intentionally killed and wants to prove it.

The Los Angeles County coroner has not yet formally ruled on what caused Jackson''''s death from cardiac arrest on June 25.

A family source said: "Katherine looked at the second autopsy, and she wasn''''t happy with what it did not reveal to her."

Investigators believe he was a drug addict and had taken prescription narcotics before he died.

Jackson''''s physician Dr. Conrad Murray is at the centre of the investigation, with police having raided the medic''''s home, offices and storage lockers.

Jackson, 50, suddenly collapsed at his rented home in LA, where he was rehearsing for a concert tour.

On Monday, his mother won permanent custody of his three kids. (ANI)