Mo. Rev. Stat. § 456.7-705: Resignation of trustee.

1. A trustee may resign:

(1) upon at least 30 days' notice to the qualified beneficiaries, the settlor, if living, and all cotrustees; or

(2) with the approval of the court.

2. In approving a resignation, the court may issue orders and impose conditions reasonably necessary for the protection of the trust property.

3. Any liability of a resigning trustee or of any sureties on the trustee's bond for acts or omissions of the trustee is not discharged or affected by the trustee's resignation.