I currently have a lawyer, who I have discovered has an unethical background and I want to fire him.

You need to consult the contract you signed with the attorney.  In the agreement it should state how to terminate the agreement.  If no such language exists, you should consult a local attorney to determine how to terminate the agreement with as little liability to you as possible. This is not intended to be legal advice, and is general in its nature. No attorney-client relationship exists or is formed by this information. Furthermore, this does not represent the views or opinions of LexisNexis or its affiliated companies.