Oklahoma constitution
Article VII: judicial power
Section 3

From each of the Supreme Court districts and Court of Criminal Appeals districts, the voters thereof shall elect a Justice of the Supreme Court and a Judge of the Court of Criminal Appeals at a nonpartisan election, in a manner provided by statute. In the event intermediate appellate courts are created, the judges thereof shall be elected at a nonpartisan election, in a manner provided by statute. In the event of a vacancy the Governor shall, by appointment from said district, fill such vacancy until the next election for State Officers, and at such election the vacancy for the unexpired term shall be filled by a nonpartisan election in a manner provided by statute.