Okla. Stat. tit. 74, § 913e

Notwithstanding any other provision of law to the contrary, the spouse of a person who initially became a member of the system in January 1999, and such member dies within one month of meeting the required six (6) years of full-time-equivalent employment with a participating employer for normal retirement purposes, shall be allowed to elect to purchase at the actuarial cost of up to one month of service to meet the six (6) years of full-time employment. The election pursuant to this section shall be made on or before September 1, 2005, and payment shall be made to the Oklahoma Public Employees Retirement System on or before December 31, 2005. Upon receipt of payment by the system, the electing spouse shall begin receiving benefits pursuant to Option B as provided in Section 918 of Title 74 of the Oklahoma Statutes.