Good question. If you have discovered that a person that you named as a defendant to a legal action really should not be a defendant to your lawsuit, there are forms entitled "request for dismissal" that you can find online in your state.The forms have boxes to be checked and names filled in regarding the dismissal of an entire action or a particular person. You fill in the form, serve it on all parties after you have signed it and file it with the court. Once filed, the defendant that you named is no longer a party to the action. Good luck.