Sample Letter to Bank Informing the Death of the Account Holder. The death claim letter should be written in the formal letter format.To sum up, I want to inform you that my husband died in a car accident on 28th July 2022. Moreover, he has a savings bank account in your bank. This is to notify the bank that my. (Relationship with deceased). I need to write to several organisations including banks, insurance and mortgager company to inform them of my partners death. Dealing with the death of someone close to you is never easy. We've put together a guide of what to do if your loved one had an investment account with us. Notify a third party about a person's death.