You can't remove him unless there is some agreement (e.g. a  buyout agreement) allowing a majority of the owners to remove/buyout a minority of owners; the fact is, he owns some percentage of the corporation (1/3, if you split it evenly), and you can't make him give up his ownership unless there is some agreement to that effect in place. You can of course try to negotiate a voluntary buyout of him--come to an agreement under which the two of you will purchase his share. You could also seek to dissolve the corporation and look to start a new one with just the two of you, but you'd have to resolve issues like who gets ownership of any intellectual property, good will, customer lists, etc.