Once the money comes into your possession, it is most likely subject to garnishment/seizure. Before the money gets to you, there are a number of relevant factors:
1) Where did the decedent die?
2) Did the decedent have a will or trust?
3) In what state is the will/trust being probated or administered?
4) Did the will/trust have a spendthrift provision and what were the limits?
5) What is the law of the relavent state regarding spendthrift provisions and support obligations?
You don't need to answer any of these questions for me because I won't be able to advise you. The crucial point is this. Most wills/trusts contain something called a spendthrift provision. Such provisions are in place in order to protect the inheritance from creditors of the will or trust (usually, the decedent wants the money going to their heir or beneficiary, and not to his/her creditors.) So, then the question becomes, if there was a spendthrift provision, can it be disregarded in whole or in part, pursuant to the law of the state in which the will or trust is being administered.
Call an attorney in the state where the person died, or, where the will/trust is being administered. Having said that, I like the comment about paying off the debt given some new found wealth. (Maybe you can negotiate a discount, especially if the creditor couldn't get to the money anyway.)