The sister of the late music icon Prince filed court papers Tuesday asking for a special administrator to oversee his estate, saying the singer left no will.

Tyka Nelson, the only full sibling of the star who died Thursday at age 57, stated in a probate petition to a Carver County, Minnesota, court, “I do not know of the existence of a will and have no reason to believe that the decedent executed testamentary documents in any form.” TMZ.com, which first reported the filing and obtained a copy of the document, said she asked that Prince’s longtime financial-services provider, Bremer Trust, National Association be appointed administer.

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The document lists as additional “interested parties” Prince’s half brothers John Nelson, Alfred Jackson and Omar or Omarr Baker (sources vary); half sisters Norinne Nelson and Sharon Nelson; and a deceased half sister Lorna Nelson. A deceased half brother, Duane Nelson, who spent 12 years as a security guard for Prince until the two acrimoniously parted ways, goes unmentioned.

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The document additionally notes, “The decedent has heirs whose identities and addresses need to be determined.”

Attorney Jerry Reisman, of Garden City’s Reisman Peirez Reisman & Capobianco, who has no connection to the estate, told USA Today, “It’s astonishing, absolutely astonishing that he did not have a will,” and predicted, “You’re going to have ‘siblings’ coming out of the woodwork alleging they are siblings.”

Prince’s longtime lawyer, L. Londell McMillan, did not respond to media requests for comment.

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The Los Angeles Times estimated the value of Prince’s estate as $300 million, though the paper did not say on what it based that figure.