These are questions for a criminal defense attorney. I am not aware that fleeing the U.S. and renouncing citizenship can make one immune from prosecution, however speak with a criminal defense lawyer to get a definitive answer.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.
This is not an immigration question talk to your criminal defense attorney.
Franco Capriotti - Senior Immigration Counsel
CAPRIOTTI INTERNATIONAL LAW
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IMMIGRATION LAW PROFESSOR for 10 years -- LEGAL DISCLAIMER: This answer is offered for informational purposes only. It does not constitute an attorney-client relationship.