I can feel for you...as I read the story, I wished a tragic end to that individual!!
We had a registered sex offender living across the street from us not long ago. The school bus even stopped in front of the house!
He had done time years ago for molesting a 9-yr old girl. My daughter was 9 at the time he lived in our neighborhood.
My wife happened to check the website and discovered that he lived there. She alerted the rest of the families in the neighborhood and got the bus service to move the bus stop.
Fortunately, the predator was renting and moved out a few months later.
But if you check around, you'll be surprised how many predators live in your area!!