I wish I had a crystal ball that would let me answer your question, but unless you are able to contact the person monitoring this situation, there is no way to know. The person may have been returned to custody, he may have gone to Vegas to hide out before his final hurrah (it happens all the time), he may be unemployed and excused from paying, and there could be a thousand other excuses. Hope this perspective helps!
Attorney Bunce is right, almost anything could have happened. You should have kept calling your "contact" until you made contact. After this much time has passed, the liklihood you will ever get another payment is very low. Stranger things have happened though. Good luck to you.