Mo. Rev. Stat. § 454.1518: Duration of personal jurisdiction.

Personal jurisdiction acquired by a tribunal of this state in a proceeding under sections 454.1500 to 454.1728 or other law of this state relating to a support order continues as long as a tribunal of this state has continuing, exclusive jurisdiction to modify its order or continuing jurisdiction to enforce its order as provided by sections 454.1527, 454.1530, and 454.1545.