Filed a police report about a contractor taking money and not doing the job. I see that it has been handed to criminal court district attorny

You should contact the district attorney for the case directly or the DA's office and ask to speak with the DA in charge of the case to see what assistance they need from you.  At the very least, you should send them proof of your financial losses so that in the event of a conviction, restitution to you of those losses can be made a part of the sentence.