Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.This person died on. , (date of death) at the age of _____ years. Start the letter with your introduction and the reason for writing the letter. I need to write to several organisations including banks, insurance and mortgager company to inform them of my partners death. What do you write in a death notice? Mandl offers training in the Dental Assistant, Diagnostic Medical Sonography, Health Care Administration,.