Next of Kin Letter is a document used to confirm who is the closes relative of the deceased that are still living. One thing for sure is that the bank will want to know the specific reasons for the removal request as the next-to-kin.To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. NAME AND ADDRESS OF NEXT OF KIN (Other than spouse). Create a professional next of kin letter. Build and share in seconds. If Administration, c.t.a. Create a professional Next of Kin Letter with Jotform Sign to get the process of asset distribution going. Open an account. checkbook. In the approval letter.