Okla. Stat. tit. 8, § 37

Provisions in any contract, agreement, deed or charter and any bylaw, rule, restriction, covenant or regulation adopted or put in force either subsequent or prior to the effective date of this act authorizing, permitting or requiring the denial, refusal or prohibition of the privilege of interment, entombment or burial because of race, color or national origin of any deceased person are hereby declared to be null and void, unenforceable and in conflict with the public policy of this state. Laws 1971, c. 267, § 2.