Proof of death, such as certified copies of the death certificate. Sub: Request to close an account due to death.How Do Bank Closure Letters Work? Navigating and closing a deceased person's bank account can be tricky. Follow these simple steps to ensure you are able to properly close the account. Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format. A death claim letter format for bank is straightforward. Moreover, you just have to submit documents like a death certificate, ID proof, etc. Sample letter to close bank account of deceased.