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. This is to notify the bank that my. (Relationship with deceased). You would need an official letter from the agency saying you need the death record to process the claim. Sample Letter – Asking for a debt write-off when someone is deceased. I need to write to several organisations including banks, insurance and mortgager company to inform them of my partners death. Everyone's legal situation is different. Can I sign up to have my bill automatically deducted from my bank account?