Mo. Rev. Stat. § 461.011

For the purpose of discharging its duties under the nonprobate transfers law, the authority of a transferring entity acting as agent for an owner of property subject to a nonprobate transfer shall not cease at death of the owner. The transferring entity shall transfer the property to the designated beneficiary in accordance with the governing instrument, the rules of the transferring entity and sections 461.003 to 461.081.