Yes, under IL law spouse may request (or he can waive requesting) 50% of the value of your pension that has accumulated from the date of marriage until the date of any divorce judgment, it's a negotiable issue, like most of the other issues in a divorce case.
Unfortunately you have not provided enough information with which to formulate an answer. Are you divorced? Where was the judgment entered? Was he awarded a portion of your pension in the divorce? If he was then he may be entitled to take his portion of your retirement.
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