Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.Start the letter with your introduction and the reason for writing the letter. Call (804) 662-6200 for complete instructions. This manual is intended to assist persons who are involved in the administration of a decedent's estate in Virginia. I need to write to several organisations including banks, insurance and mortgager company to inform them of my partners death. Sample Letter – Asking for a debt write-off when someone is deceased.