Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.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. 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. Family members or the executor are usually responsible for informing the bank of the death. This is to notify the bank that my. (Relationship with deceased). After someone dies, notify the government programs and businesses they used.