Mo. Rev. Stat. § 193.155: Delayed filing, registration.

1. When a death occurring in this state has not been registered within the time period prescribed by section 193.145, a certificate of death may be filed in accordance with department rules. Such certificate shall be registered subject to such evidentiary requirements as the department shall prescribe to substantiate the alleged facts of death.

2. Certificates of death registered one year or more after the date of death shall be marked "Delayed" and shall show on their face the date of the delayed registration.