Michigan Compiled Laws, Chapter 700. Estates and Protected Individuals Code § 700.3403

Sec. 3403. (1) Upon commencement of a formal testacy proceeding, the court shall fix a time and place of hearing. The petitioner shall give notice in the manner prescribed by section 1401  1 to each of the following persons:

(2) Notice may be given to other persons. In addition, the petitioner shall give notice by publication to each unknown person and to each known person whose address is unknown who has an interest in the matters being litigated. If the proceeding involves a request for appointment of a personal representative and it appears that the deceased died intestate without leaving a known heir, the petitioner shall give notice to the attorney general, public administration division.

(3) If it appears by the petition or otherwise that the fact of the decedent's death may be in doubt, or on the written demand of an interested person, a copy of the notice of the hearing on the petition shall be sent by registered mail to the alleged decedent at his or her 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 by any of the following methods:

(4) The costs of a search conducted under subsection (3) shall be paid by the petitioner if there is no administration or by the decedent's estate if there is administration.