Montana Title 42. Adoption § 42-2-302. Persons whose consent not required

(1) an individual whose parental relationship to the child has been judicially terminated for unfitness or has been determined not to exist or who has waived parental rights;

(2) a parent who has been judicially declared incompetent;

(3) an individual who has not been married to the mother of the child and who, after the conception of the child, executes a notarized statement denying paternity or a notarized statement acknowledging paternity and denying any interest in the child; or

(4) the personal representative of a deceased parent's estate.