Missouri Application For Letters Testamentary — Application For Letters of Administration Will Annexed is an application form used in Missouri to open an estate when the deceased has left a will. The form is used when a personal representative, such as an executor or administrator, is appointed to handle the estate. The form is also used when the deceased has not left a will and the court is appointing an administrator to handle the estate. There are two types of Missouri Applications For Letters Testamentary — Application For Letters of Administration Will Annexed: Testify and Intestacy. The Testify Application is used when the deceased has left a will. The Intestacy Application is used when the deceased has not left a will. Each application includes information such as the name and address of the deceased, the decedent's date of death, the names and addresses of the heirs, the list of assets and liabilities, and the name and address of the personal representative.