Mo. Rev. Stat. § 433.130: Surety discharged from future liability, when, how.

Any person bound as surety in any bond given by any officer, including personal representatives, guardians, conservators, assignees, receivers, trustees and depositaries to secure the faithful performance of the duties of such officer, may, on his petition in writing addressed to the court authorized by law, for the time being, to take and approve such official bond, be discharged from all future liability on such official bond.