Okla. Stat. tit. 58, § 712

Whenever an executor, administrator, or guardian is committed for contempt, in disobeying any lawful order of the district court or the judge thereof, and has remained in custody for thirty (30) days without obeying such order or purging himself otherwise of the contempt, the district court may, by order reciting the facts, and without further showing or notice, revoke his letters and appoint some other person, entitled thereto, executor, administrator or guardian in his stead.