Okla. Stat. tit. 60, § 60-175.39
Removal of trustee - Filling vacancies
Trustees having violated or attempted to violate any express
trust, or becoming incompetent or insolvent, or of whose solvency or
that of their sureties there is reasonable doubt, or for other
cause, in the discretion of the court having jurisdiction, may, on
petition of any person interested, after hearing, be removed by such
court and denied compensation in whole or in part; and any
beneficiary, cotrustee, or successor may treat the violation as a
breach of trust; and all vacancies in express trusteeships may be
filled by such court.