Are attorneys legally or ethically bound to share evidence or discovery materials in civil matters before actual complaints are filed?
Let's say Person A (a non-public figure) suspects Person B (a non-public figure) of a civil tort, such as defamation.
Person A gets Lawyer A to send a cease and desist letter to Person B. Person B shows the letter to their Lawyer (B). Lawyer B asks Person B if they have indeed defamed Person A. Person B says they have and outlines the incidents. Lawyer B determines there is enough evidence that the defamation did damage the reputation of Person A and more than likely resulted in monetarily loses in business for Person A.
Is Lawyer B obligated in any legal or ethical sense to inform Lawyer A of what Person B said before a complaint is filed? Or only after a complaint is filed? And only when discovery takes place? Or would Lawyer B inform Lawyer A out of common and/or professional courtesy?