Sample Letter – Asking for a debt write-off when someone is deceased. This is to notify the bank that my.(Relationship with deceased). The death claim letter should be written in the formal letter format. Check the samples provided below for your reference. In New York State, the Surrogate's Court decides what happens to a person's property when that person dies. A death claim letter is an official letter to the bank. I need to write to several organisations including banks, insurance and mortgager company to inform them of my partners death. The person who died is called the Decedent. That person's property is called the estate.