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I am suspicious it is a workers comp retaliation case as well, basically because of the timing. Specifically, your FMLA leave allotment expired months ago, so they could have terminated you then without recourse, because if you cannot do the job, workers comp doesn't guarantee you the right to return to your job. But now that you told them you are coming back soon, they terminate you, leading to the assumption that it is because they believe you are a workers compensation liability for risk of re-injury and another claim. So you should consult with an attorney in your are about bringing a retaliation claim.
With regard to your healthcare, they can eliminate that on the day of termination, they do not have to give any grace period, much less a month.
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