Was he one of the many mentally ill who are not 'an imminent danger to himself or others' who then refuses any help and can't be forced to take it even if offered?

If he didn't think he needed/wanted help, he can't be forced to do anything unless he commits a crime.  Even if he voluntarily participates, he can quit medication or counseling any time he wants.  That's how Officer Chris Killcullen got killed.  She quit taking her meds.