Oregon Revised Statutes Courts of Record; Court Officers; Juries § 9.380

(1) The attorney in an action or proceeding may be changed, or the relationship of attorney and client terminated, as follows:

(2) The relationship of attorney and client may be terminated after the entry of a judgment or other final determination in an action or proceeding by the filing of a notice of termination of the relationship in the action or proceeding. The notice must be signed by the attorney and must state that all services required of the attorney under the agreement between the attorney and the client have been provided.