If a person dies without a Will, then the proceeding filed is called administration and the property is divided according to the law. To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account.In general, you can't. The bank will not allow you to close it unless you have a letter of authorization from the probate court. If the Decedent didn't have a Will, then there is a rule for who can file the small estate affidavit. Both kits have forms and instructions to open and close a simple probate. They do not cover administration of the estate. Complete the information requested on the Mail-in Claim Form page. The Personal Representative must complete forms to close an estate. Instructions are available.