Hawaii Revised Statutes Division 3. Property; Family § 560:3-403

(a) Upon commencement of a formal testacy proceeding, the court shall fix a time and place of hearing. Notice shall be given in the manner prescribed by section 560:1-401 by the petitioner to the persons herein enumerated and to any additional person who has filed a demand for notice under section 560:3-204. The notice shall include the name and address of the applicant, the name and location of the court hearing the petition, and the date of the hearing.

(b) Notice shall be given to the following persons: the surviving spouse or reciprocal beneficiary, children, and other heirs of the decedent, the devisees and executors named in any will that is being, or has been, probated, or offered for informal or formal probate in the judicial circuit or that is known by the petitioner to have been probated, or offered for informal or formal probate elsewhere, and any personal representative of the decedent whose appointment has not been terminated. Notice may be given to other persons. In addition, the petitioner shall give notice by publication to all unknown persons and to all known persons whose addresses are unknown who have any interest in the matters being litigated.

(c) If it appears by the petition or otherwise that the fact of the death of the alleged decedent may be in doubt, or on the written demand of any interested person, a copy of the notice of the hearing on the petition shall be sent by registered or certified mail to the alleged decedent at the alleged decedent's last known address. The court shall direct the petitioner to report the results of, or make and report back concerning, a reasonably diligent search for the alleged decedent in any manner that may seem advisable, including any or all of the following methods:

The costs of any search so directed shall be paid by the petitioner if there is no administration or by the estate of the decedent in case there is administration.