Really? Well, if he did get married to another woman without getting a divorce from his first wife, then the second marriage is not legal. It would be a common-law marriage, which would mean he's still the legal party over his wife. I don't know why he never divorced her. Maybe it was because she was already in this state, and knew what would happen if he did. (The same thing that's happening now.) He's been fighting for years to have her feeding tubes removed. After she dies he would be able to claim his current wife as a legal "wife." Some religions teach that divorce is an evil thing, not of Christ, and one must never divorce their spouse. Perhaps that's why he's never divorced her. I don't remember what religion he is, but I believe her parents are Roman Catholic, which teach some things like that.
I guess really there's no point on speculating why he never did it. We'll never fully know. I just think it's pathetic that so many people are getting involved and protesting the whole thing, especially when about 99% never even heard of her until this thing started. People are trying to make decisions that they have no say it. It's not their place to judge if it's murder.
H-D