It is legally yours. You need to hire an attorney to take care of this NOW so you do not have to deal with his executor in the estate. Move quickly to hire an attorney with expertise in this area. It should not be hard to present a certified copy of the to whoever handles the 401K and then you can setup your own IRA/401K account to roll the funds into to avoid tax penalties. Again act now.
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You need to speak with a local attorney promptly about your question. It appears from your description that the Court awarded a portion of a retirement account to you. Then your ex-husband withdrew the funds and rolled them over into a different retirement account. There is a legal principle called constructive trust that may preserve your right to your share in the retirement funds even after your ex-husband moved them. There may be other legal theories that apply. It would be much easier to address these matters in the divorce action while your ex-husband is still living. it is also important to find out where he moved the funds so you can give notice to the plan administrator of competing claims to the funds. They may otherwise be distributed to beneficiaries, making it very hard to recover.
If we do not have a written attorney-client agreement: I am not your lawyer; you are not my client; this is not legal advice.
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