Okla. Stat. tit. 22, § 361
From the persons selected to serve as multicounty grand jurors, the court shall appoint a foreman. The court shall also appoint a foreman when a person already appointed is discharged or excused before the multicounty grand jury is dismissed.
Laws 1987, HB 1177, c. 99, § 12, eff. November 1, 1987.