What do you write in a death notice? Sample Letter to Bank Informing the Death of the Account Holder.The death claim letter should be written in the formal letter format. 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. Use this letter when someone you know has died and they have left no assets or will behind. Contact us for advice before using this letter. This is to notify the bank that my. (Relationship with deceased). 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.