Okla. Stat. tit. 74 § 932
Except for the member's name, age, amount of contributions paid in, benefits being paid, amount of credited service and any documents verifying credited service or benefits, all information, documents and copies thereof contained in a member's retirement file shall be given confidential treatment and shall not be made public by the System without the prior written consent of the member to which it pertains, but shall be subject to subpoena or court order. Notwithstanding any provision to the contrary, the System may release tax information returns of a deceased member to a person acting in a fiduciary capacity on behalf of the decedent or the decedent's estate for the purposes of filing a tax return, a court-appointed personal representative or administrator of the decedent's estate, the person responsible for an intestate estate, a trustee of a valid trust document, the decedent's prior attorney-in-fact, the spouse of the decedent, the decedent's court-appointed guardian, or some other person acting on behalf of the decedent.
Okla. Stat. tit. 74, § 932