Final  update on the creep:

Turns out he was using a false name, has an outstanding warrant for his arrest in another state, and a string of other criminal issues.  The police asked me to lure him back onto the property so they could arrest him, so I made up a piece of paperwork he needed to sign for his termination.  He didn't buy it, and never showed up.  We got back the results of the drug test he took to get hired on with us, which were positive for drugs.  Honestly, why did he even bother?  He can't be stupid, or he'd have been caught.  But still.  What made him think we were going to hire him, and that no one would ever find out when he's standing on a bucket to look into someone's window?