Can a coworker sue another coworker who stole over twenty thousand dollars from his employer.

I referred a friend, whom I had known for over thirty years, to work with me for a small company here in Florida. During the six months that he was employed, he stole over twenty thousand dollars costing me money due to my pay raise that was due to me. The owner has worked out some form of payment with this former coworker to repay what was stolen. Since I had known this man for over thirty years, I learned that he has stolen from nearly every employer he has worked for. What can be done to possibly prosecute. He is a Canadian citizen.