Hi - my name is XXXXX XXXXX X'm a Real Estate litigation attorney here to assist you.
The only way you could do this is to sue the individual's estate for the money you're due and get a judgment against him. Once you have a judgment, it will serve as a lien against the estate and any property or assets he owned at the time of his death. The lien would have to be paid off with the proceeds from the estate.
You can also seek an injunction for immediate relief. This would order the estate/his wife not to dispose of the property until the legal matter is resolved.
You can't arbitrarily file a lien against the person's property without a judgment because you don't have a security agreement giving you a lien - like a promissory note, UCC-1 financing statement, deed of trust, etc.
Ok. In that case, I would recommend that you speak with a business law or estate law attorney in Florida to file a petition for a temporary restraining order and injunctive relief to stop her from disposition of this property until the court decides the legal issues, your ownership, etc. with it.
All you have to show is that irreparable harm will occur if the restraining order/injunction is not granted, and I don't think you would have a problem with that in this instance.
A lawyer is the best way to get this done fast and correctly.
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