Mo. Rev. Stat. § 473.140
If any personal representative becomes mentally incapacitated or is convicted of a felony or other infamous crime, or becomes an habitual drunkard, or in any manner incapable or unsuitable to execute the trust reposed in him, or fails to discharge his official duties, or wastes or mismanages the estate, or acts so as to endanger any corepresentative, or fails to answer any citation and attachment to make settlement, the court, upon its own motion, or upon complaint in writing made by any person interested supported by affidavit, after notice to the personal representative, and to the attorney of record, if any, of any personal representative who cannot be served with notice in this state, shall hear the matter and may revoke the letters granted.
§ 473.140, RSMo