Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.A death claim letter format for bank is straightforward. Moreover, you just have to submit documents like a death certificate, ID proof, etc. A funeral home or other similar agency has up to 7 days to submit complete and accurate information regarding a death in our county. This is to notify the bank that my. (Relationship with deceased). Do you need to find an executor checklist for what to do when someone passes away in Arizona? Click here to see our recommendations. Fill out the probate information cover sheet, informal checklist, the application, and attach the original will.