Mo. Rev. Stat. § 451.030
451.030 Bigamous marriage void.
451.030. Bigamous marriage void. — All marriages, where either of the parties has a former wife or husband living, shall be void, unless the former marriage shall have been dissolved.
(RSMo 1939 § 3362) Prior revisions: 1929 § 2975; 1919 § 7300; 1909 § 8281