If the incident involves potentially criminal acts (drugging, physical/sexual assualt, etc.) then the OP needs to stop posting and talk with local law enforcement.

If this involves a legal issue (usage, not getting compensation) then seeking counsel regarding the matter is the best course.

I'm surprised this thread hasn't been locked.  The OP's question has been answered numerous times with the consensus being that she should put a "do not recommend" listing on her profile if she wishes to want to warn other Models about this particular Photographer.  The potential downside for doing this is that Photographers wanting to work with the OP may not desire to do so if they see such a list.

My advice is to list the Photographer amongst other Photographers that you've worked with with a heading  "Inquiries welcomed  about my experience with these Photographers" or something to that effect. That way you don't come off as negative and vindictive but give the Models that are doing their homework a chance to know that you may have some info for them.