Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.This letter is from an executor notifying a bank about an account holder's death. Discover everything about a Notice of Probate Sample Letter. You can notify us in a single step. Choose one of the three methods below and we'll share the notification across the bank. This set provides coverage of every aspect of probate law and estate and trust administration in Texas. It includes sample forms and letters.