Hello positivechang,
Have you tried the VINELink system? It's a nationwide victim notification system that you can search to find out if 'your' offender is still in custody, but you can also sign up for e-mail or other notification when the person is released. Might be worth checking out.
Here's the link:
https://www.vinelink.com/vinelink/initMap.do
Mr. S and I used this during his son's fun-filled Crack days...