Joe Jackson`s lawyer Brian Oxman submitted papers on behalf of his client in California Superior Court against the medic - who has been accused of involuntary manslaughter in relation to the `Thriller` singer`s death in June 2009 - and the companies which he is affiliated with. Joe claims Murray wrongfully provided the powerful anaesthetic Propofol and a "polypharmacy" of other drugs to his son just before he died. Joe also alleges Murray asked a security guard to clean the room in which Michael died of medication before police arrive at the Los Angeles mansion. The suit names Michael`s mother, Katherine Jackson, and his three children as "nominal plaintiff parties". Although a previous lawsuit by Joe has been dismissed by a US court, he is convinced Murray played a huge part in Michael`s death and wants justice. A Los Angeles coroner ruled the pop legend`s passing was caused primarily by two sedatives, Propofol and lorazepam, and acute Propofol intoxication was the principal cause. Murray - who was hired as Michael`s personal doctor while he rehearsed for his 50-night concert residency in London - admitted giving him Propofol as a sleep aid, but his lawyer insisted the amount was much smaller than what was found in Michael`s body during the autopsy. Earlier this year, prosecutors charged Murray with involuntary manslaughter, to which he pleaded not guilty. However, if convicted, he faces up to four years in prison.