Once more I feel compelled to point out that in 30 years of administering employer sponsored benefits, I have yet to see a plan that did not have a provision for keeping a divorced spouse on the plan. And I have had employees in CA.
Two things I am tired of typing: 1.) A wrongful termination does not mean that you were fired for something you didn't do; it means that you were fired for a reason prohibited by law. 2.) The above answer, whatever it is, assumes that no legally binding contract or CBA expressly says otherwise. If it does, the terms of the contract apply.