Michael Jackson's doctor is seeking the dismissal of a wrongful death lawsuit filed by the singer's father.
Lawyers for Dr Conrad Murray sought the dismissal in a motion filed on Wednesday in Los Angeles.
The documents ask a judge to dismiss the case on the basis that Jackson's father, Joe Jackson, did not have the legal right to file the case on grounds that he's not a beneficiary of the estate.
The Jackson family patriarch sued Murray in a federal court on June 25, the one-year anniversary of his son's death. He claimed the doctor acted negligently by providing the pop singer with a mix of sedatives, including the anaesthetic propofol.
Murray pleaded not guilty to involuntary manslaughter in criminal court.
Meanwhile Michael Jackson's mother is suing the promoter of what were intended to be Jackson's comeback concerts for fraud and other claims related to his death.
The complaint accused AEG Live of failing to honour its agreement to provide Dr Murray with lifesaving equipment. The suit says AEG Live is liable for the actions of Dr Murray.
Katherine Jackson, who is the guardian of the singer's three children, also sued on their behalf.
AEG spokesman Michael Roth said the company had not seen the lawsuit and had no immediate comment.
Katherine Jackson filed her lawsuit in Los Angeles Superior Court and is seeking unspecified damages.