Mont. Code Ann. § 72-3-524
Termination of appointment -- closing of estate
72-3-524 . Termination of appointment -- closing of estate. (1) An appointment of a personal representative terminates, as provided in 72-3-1004 , 1 year after the filing of a closing statement.
(2) An order closing an estate as provided in 72-3-1001 , 72-3-1002 , or 72-3-1003 terminates an appointment of a personal representative.