To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. These forms helpful when handling the estate of a deceased person.If you have questions, consult with an attorney. They will return any direct deposit checks from Social Security which the deceased may have received but not been entitled to receive. Determine Date of Death values (DoD). 4. Open estate checking account. To close a bank account after death, you must completely liquidate its funds. KeyBank guides you through the process of settling a loved one's financial accounts after they die. These forms will be useful when filing required documents related to estates of deceased or incapacitated persons. One year after the death of the decedent if no grant of letters is in effect.