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). Start the letter with your introduction and the reason for writing the letter. Notify a third party about a person's death. The first step to beginning the probate process is filling out the correct forms. I need to write to several organisations including banks, insurance and mortgager company to inform them of my partners death. Sample Letter – Asking for a debt write-off when someone is deceased. Performances will take place in the McCreary Theatre August 14-16 at p.m.