shlufnisht – I don’t understand, you say in the end of your post that now he can go to shul and not worry. I thought you said this person is still free?
If you want to know if this person is known, google Yerachmiel Lopin. I don’t agree with everything he posts, but he is a big fighter for molesters going to jail and will check out names and ask around for other victims. It may be worth contacting him through his website for that.
I daven for your child’s complete refuah. It is a long, difficult road.