Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.The procedure is very simple. Get the death certificate and legal heir certificate. This is to notify the bank that my. (Relationship with deceased). The Probate Court may oversee the division of property of someone who has died. This property is called a decedent's estate. Affidavit-death forms are used to change the title on rea l property after the death of a joint tenant, trustee or trustor. Banks do not need an original death certificate.