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I would like to help you with this matter. It will depend mostly on what your paperwork says. In other words, what does your operating agreement, or your by-laws say is the procedure for dissolving the company or removing a member? Also, is he a member or the director, or what? In order to form an LLC, you have to file papers at the Sec of State as you well know. But, after that, there re internal rules and regulations set up by the members, organizer, director or board. Those internal rules will explain how to get rid of him. If you don't have any of these written down and you have the authority to do so, set up some by-laws and get him removed. Unless you have internal rules that both of you must sign for any changes to the membership.