Okla. Stat. tit. 22, § 22-839: Discharge of defendant that he may testify for state

When two or more persons are included in the same indictment or

information, the court may, at any time before the defendants have

gone into their defense, on the application of the district

attorney, direct any defendant to be discharged from the indictment

or information, that he may be compelled to be a witness for the

state.