Hi
Unfortunately, you've posted your question on a UK-based site, where the laws relating to inheritance are probably different to those in the USA. (In the UK, somebody who is in prison retains their right to inherit from a will, although there might be practical difficulties with them acting as executor of an estate).
There are a few American contributors to the Answerbank but I doubt whether any of them would have the relevant specialist knowledge to answer your question.
I suggest posting on a US-based website, such as one of these:
http://answers.yahoo.com/
http://www.answerbag.com/
Chris