Okla. Stat. tit. 8, § 88

A. The superintendents or wardens of state correctional facilities, of state hospitals and of state institutions are hereby authorized and directed to remove the bodies of the deceased inmates or patients from such facilities and institutions, that are not claimed for private burial by friends or relatives thereof within ninety-six (96) hours after the death, and the superintendent or warden of such facility or institution shall notify the friends or relatives of the deceased inmate or patient by registered mail of the death of the deceased inmate or patient at the last known place of residence, if known, in accordance with state law and agency rules. B. When the State Anatomical Board rejects the body of a deceased inmate or patient, the superintendent or warden of that facility or institution shall have the rejected body buried in lands of that facility or institution set aside for such purpose, or in such place authorized by law or agency rule. Provided, that the expenses of such burials shall be paid from the support and maintenance appropriation or any other appropriation made for the operating expenses of the facility or institution.