With the new "sex offender" information I would definitely be going to the police station with pictures of this guy blocking May's parking spaces as well as copies of every complaint I've made and demanded to speak to supervisors, etc going up the ladder as far as I can to get this guy taken care of. If he really is on a sex offender list and you ARE that close to a school I would be asking if it's even legal for him to live there at all, nevermind his crappy cars. If the police still won't do anything - go to the mayor, the news, even the governor (sometimes you have to yank some serious chains to get some action) until it was done. This guy has proven he will continue to escalate, has threatened others, and is creating multiple nuisances. He needs to go.