Documentation about the account and its owner, including the deceased's full legal name, Social Security number, and the bank account number. You should produce the concerned Bank branch the death certificate from municipal authority as proof of that persons demise.What details are required to close a bank account? Sub: Request to close an account due to death. The letter shall start with the sender's address, date, bank's address, and with a salutation. A death claim application letter for a bank is basically a letter to the bank stating that the account holder has been deceased. The Federal Edition in 12 volumes. Vol. III (Letters and Misc.