@Gregory480 What a dreadful situation to be in, and I fully understand your discomfort under the circumstances. Normally I take the ‘innocent until proven guilty’ stance, however this guest has already been proven guilty once and is now about to be tried for further offence(s). Personally I do not like to get involved in our guests private business, however I do also think I owe my neighbours a ‘duty of care’ and in this situation I would probably let the guest know that you are now aware of the circumstances and ask him to cancel his reservation for a full refund regardless of your cancellation policy. Moving forward should he refuse to do so then I would either escalate to Airbnb and ask them to cancel penalty free for you or advise the guest that you have no option but to notify neighbours and incoming guests to your other apartment of the situation… obviously this is not a route either you or he would want to take. You might find the following link of some help.
https://www.meganslaw.ca.gov/
I totally understand that people with this sort of history do need to live somewhere, but you also have a business which you need to protect and unless you restrict your guests to ‘no children’ then you will always be worrying with each intake of new guests.