Okla. Stat. tit. 74 § 918
Option A. Joint and one-half to joint annuitant survivor. A reduced retirement benefit is payable to the retiree during his or her lifetime with one-half (1/2) of that amount continued to the joint annuitant during such joint annuitant's remaining lifetime, if any, after the death of the retiree. If the named joint annuitant dies at any time after the member's retirement date, but before the death of the retiree, the retiree shall return to the retirement benefit, including any post-retirement benefit increases the member would have received had the member not selected Option A. The benefit shall be determined at the date of death of the named joint annuitant or July 1, 1994, whichever is later. This increase shall become effective the first day of the month following the date of death of the named joint annuitant or July 1, 1994, whichever is later, and shall be payable for the retiree's remaining lifetime. The retiree shall notify the Oklahoma Public Employees Retirement System of the death of the named joint annuitant in writing. In the absence of the written notice being filed by the member notifying the Oklahoma Public Employees Retirement System of the death of the named joint annuitant within six (6) months of the date of death, nothing in this subsection shall require the Oklahoma Public Employees Retirement System to pay more than six (6) months of retrospective benefits increase.
Option B. Joint and survivor. A reduced retirement benefit is payable to the retiree during his or her lifetime with that amount continued to the joint annuitant during the joint annuitant's remaining lifetime, if any, after the death of the retiree. If the named joint annuitant dies at any time after the member's retirement date, but before the death of the retiree, the retiree shall return to the retirement benefit, including any post retirement benefit increases the member would have received had the member not selected Option B. The benefit shall be determined at the date of death of the named joint annuitant or July 1, 1994, whichever is later. This increase shall become effective the first day of the month following the date of death of the named joint annuitant or July 1, 1994, whichever is later, and shall be payable for the retiree's remaining lifetime. The retiree shall notify the Oklahoma Public Employees Retirement System of the death of the named joint annuitant in writing. In the absence of such written notice being filed by the member notifying the Oklahoma Public Employees Retirement System of the death of the named joint annuitant within six (6) months of the date of death, nothing in this subsection shall require the Oklahoma Public Employees Retirement System to pay more than six (6) months of retrospective benefits increase.
Option C. Life with ten (10) years certain. A reduced retirement benefit is payable to the retiree during his or her lifetime and if the retiree dies within the ten-year certain period, measured from the commencement of retirement benefits payments, such payments will be continued to the beneficiary during the balance of the ten-year certain period. If the retiree dies within the ten- year certain period, and there are no living designated beneficiaries, the person responsible for the estate of the retiree may elect for the estate to be paid the benefits for the remainder of the term or to receive the present value of the remaining benefit payments according to rules adopted by the Board of Trustees of the System. If the retiree predeceases a designated beneficiary within the ten-year certain period, and the beneficiary dies after the beneficiary has begun to receive benefits, the person responsible for the estate of the beneficiary may elect for the estate to be paid the benefits for the remainder of the term or to receive the present value of the remaining benefit payments according to rules adopted by the Board of Trustees of the System.
Okla. Stat. tit. 74, § 918