All designations of beneficiaries to a divorced spouse of accumulated employee contributions or the death benefit will be void, unless the divorced spouse has been named after the divorce decree is rendered or if the divorce decree specifies the divorced spouse is entitled to receive the benefits. The System shall void such designation of beneficiary only upon receipt of the divorce decree. The System is not responsible for any payments made in good faith without notice of divorce. The provisions of this rule are applicable for any Plan or account managed or administered by the Board.
Okla. Admin. Code § 590:10-9-3