To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. The process of claiming a bank account after death varies based on a number of factors.Here's how to claim a deceased person's bank accounts. Discover the precise steps to secure Letters of Testamentary in California. Our comprehensive guide makes the process straightforward and hassle-free. The procedure is very simple. Get the death certificate and legal heir certificate. This applies to joint tenancy and community real estate, vehicles, and things like joint bank accounts. The completed form DE150 should then be submitted to the probate court in the county in which the deceased resided in at the time of death. Notify Bank of America.