Okla. Stat. tit. 58, § 58-262: Foreign executors and administrators - Right of action -

Proof of authority - Security - Release of mortgages.

It shall be lawful for any person or persons to whom letters

testamentary or of administration have been granted, by the proper

authority in any of the United States or the territories thereof, to

maintain or defend any suit or action, and to prosecute and recover

any claim in the courts of the State of Oklahoma, in the same manner

as if the letters testamentary or of administration had been granted

to such person by the proper authority in this state, and the

letters testamentary or of administration, or a copy thereof,

certified under the seal of the authority granting the same, shall

be sufficient evidence to prove the granting thereof, and that the

person therein named has administration; Provided, that the courts

in which any action may be brought by any nonresident executor or

administrator shall have power, and such power is hereby given to

the said court, upon motion, to require from such person the

security required by law in a like case from a resident

administrator or executor; Provided, further, that such executor or

administrator shall have the authority to release mortgages in this

state upon filing with the county clerk of the county in which such

mortgage is recorded a showing properly certified to that such

executor or administrator is the duly qualified and acting executor

or administrator of such estate.