If they said "no", then you probably can't. The rules are going to be different for each state. You may wish to try asking other injured workers at the workerscompensationinsurance.com forum.
Try contacting another lawyer (or several). You can try making a police report, although your absense from the country complicates things, as does the intra-family aspect. You've probably waited too long to get any help from the annuity company, but you can try that as well.
I'm not sure I understand your situation completely. Payments that are more than 30 days late may be reported to credit reporting agencies. If your account is more than 30 days delinquent, it can be reported as delinquent. If not brought current, it can be turned over to collections. (What am I...
From what you say you had the opportunity to press charges and chose not to do so. Unfortunately it is unlikely that a prosecutor will be interested in reopening the case just because you changed your mind.
What was the total value of the contract?
What was the value of the work he performed?
How much will it cost to complete the work with another contractor?