I am an executor, devisee, or legatee named in the will, or a next-of-kin or creditor of the decedent. b. Do you need to obtain a letter of testamentary in NC?Our estate planning attorney guides you through the process in our blog. Next of Kin Letter is a document used to confirm who is the closes relative of the deceased that are still living. To close a bank account on behalf of someone who has passed away, you must have legal authority to manage the account. One thing for sure is that the bank will want to know the specific reasons for the removal request as the next-to-kin.