The musician was found dead April 21 at his home and recording studio in suburban Minneapolis. The first hearing on his estate is Monday in probate court.

Prince’s sister, Tyka (TY’-kuh) Nelson, filed paperwork last week saying Prince had no known will. Under Minnesota law, his estate would be divided among surviving siblings.

Nelson declined comment to reporters before Monday’s hearing.

Prince made hundreds of millions of dollars for record companies, concert venues and others, and owned about $27 million in property in Minnesota.

A law enforcement official who spoke to The Associated Press on condition of anonymity said investigators are looking into whether Prince died from an overdose and if a doctor had been prescribing him drugs.