755 ILCS 5/9-2

Issuance of letters of administration.) When a person dies intestate, letters of administration shall be issued in accordance with the preferences in Section 9-3 upon petition therefor, unless the issuance of letters is excused. If after letters are issued the sole administrator or all administrators die or resign or their letters are revoked, letters shall be issued in accordance with the preferences in Section 9-3.