Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.This is to notify the bank that my. (Relationship with deceased). You'll need the person's Social Security number and certified copies of their death certificate for most agencies and programs. Social Security and Medicare. Closing a bank account when someone passes away isn't difficult, as long as you have the right paperwork for the the teller or banker. Deceased Account Handling Application Form. This form is intended for Upstate NY, Long Island, and Massachusetts Electric customers. Send sample letter informing of death via email, link, or fax.