This has no defamation element. It does appear to be a matter that you could contact law enforcement though for theft.

This appears to be a privacy issue as opposed to defamation. I re-categorized it to get you a wider response. You may want to contact your state's...

Due to the doxxing element of the story I have changed this to Internet Law. I am hoping you will get a wider variety of responses.

I changed this to internet law. As it appears the statements are made directly to you, they cannot be defamatory.

I have changed this to an employee matter. You should contact an employment attorney in your area.

This is not defamation. It is actually an assault. Go to law enforcement.

Why tell them. If you feel it is necessary to report the crime, then you should do it regardless. If they sue you afterwards, it would certainly...

As you have likely heard, you can sue anyone for anything. Winning is another story. You do not mention what these staff members are saying...

Yes. You should speak with a personal injury attorney in your area immediately. There are a lot of factors that comprise the damages in a lawsuit....

There is no way to tell without knowing all of the facts. I presume he has a lawyer already. They are in the best position to provide this answer.