Mo. Rev. Stat. § 58.755
The coroner in any county to which sections 58.010, 58.020, 58.060, 58.090, 58.160, 58.375, 58.451, 58.455 and 58.700 to 58.765 apply in office on September 28, 1973, shall not be removed from office during the remainder of the term for which he was elected, but upon the expiration of his term, or upon his resignation or death, the office of coroner is abolished, and a county medical examiner shall be appointed as provided in section 58.700.
(L. 1973 S.B. 122 § 15)