Mo. Rev. Stat. § 511.050
Current with changes from the 2023 Legislative Session
If the plaintiff shall fail to file his replication, or other pleading, within the time prescribed by law or the rules of practice of the court, and to serve the adverse party, or his attorney, with a copy thereof when the same is required, judgment of non pros. shall be given against him.
§ 511.050, RSMo
RSMo 1939 § 1241