Tennessee Code Title 30. Administration of Estates § 30-1-109

(a) In all proceedings in the probate or chancery courts, or any other court having chancery jurisdiction, where the estate of a deceased person must be represented, and there is no executor or administrator of the estate, or the executor or administrator of the estate is interested adversely to the estate, it shall be the duty of the judge or chancellor of the court, in which the proceeding is had, to appoint an administrator ad litem of the estate for the particular proceeding, and without requiring a bond of the administrator ad litem, except in a case where it becomes necessary for the administrator ad litem to take control and custody of property or assets of the intestate's estate, when the administrator ad litem shall execute a bond, with good security, as other administrators are required to give, in such amounts as the chancellor or judge may order, before taking control and custody of the property or assets.

(b) This appointment shall be made whenever the facts rendering it necessary appear in the record of such a case, or shall be made known to the court by the affidavit of any person interested in the case; and, in such proceedings in the chancery court, the chancellor at chambers or clerk and master of the court on a rule day shall have authority to make an appointment in vacation.