Okla. Stat. tit. 58, § 58-471.1: Liability as dependent on time of granting letters

No real property of a deceased person shall be liable for debts

of such person unless letters testamentary or of administration be

granted within three (3) years from the date of the death of such

decedent; provided, however, that this section shall not affect the

lien of any mortgage, upon specific real property, existing and

recorded as provided by law at the date of the death of such

decedent.