Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.This is to notify the bank that my. (Relationship with deceased). Certified death certificate. •. Copy of the closing statement if there was a probate in a county other than Maricopa County. A Bank Confirmation Letter can help you learn about the full contents of the deceased's estate. Officially request a deceased person's account information. Notify a third party about a person's death. Without proper notice, creditors may be allowed up to 1 – 2 years to make a claim; once they've received notice, however, they may only have 1 – 4 months.