To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. Get an executor checklist to help with settling an estate.Learn what government programs to notify when a loved one dies. An Affidavit of Death is used to close accounts, receive benefits, or take ownership of property, real estate, or securities. Here is a checklist that you may find useful at such a time. First, gather documents. There are two ways to inform CCCU of a loved one's passing. The first option is to come into one of our six branch locations and speak with a teller. You will need to provide a certified copy of the death certificate to close the account. Step 3: Figure out who is legally responsible for any credit card debt.