Mo. Rev. Stat. § 58.190: To execute process when sheriff disqualified.

Every coroner, within the county for which he is elected or appointed, shall serve and execute all writs and precepts, and perform all other duties of the sheriff, when the sheriff shall be a party, or when it shall appear to the court out of which the process shall issue, or to the clerk thereof, in vacation, that the sheriff is interested in the suit, related to or prejudiced against any party thereto, or in any wise disqualified from acting; in such case, the county commission may require the coroner to give an additional bond.