Your fiance needs to have a criminal defense attorney review the facts of both cases and see what, if any, options he has under WA state law to expunge/seal the prior case. Every state statute is different.
Get counsel to advise you.
I am trying to give you a general answer to your question. We do not have an attorney-client relationship by this response on the avvo website. I have not been retained to represent you. I am licensed to practice law in Kentucky and in federal court in this state and the Southern District of Indiana. You need to seek legal advice from an attorney licensed to practice in your area..
You cannot get third degree assault off of one's record. However, if the Judge told him that he may be able to withdraw his plea since it was based on erroneous legal advice.
I agree with Mr. White: as a "crime against a person" 3rd degree assault is not eligible for vacation. Still, the conviction may be worth reviewing; I would recommend contacting an attorney that specializes in post-conviction relief. Good luck!
My responses to questions on AVVO are not intended to and do not form any type of attorney-client relationship. Advice you receive on the internet will never take the place of a sit down, face-to-face consultation with an attorney to discuss all of the details of your particular situation.