I don't know much about OW. I know she is foreign (so am I and my H is a succer for accents) and that she has some family here (the way my H got close to her was to help her deal with her father almost dying of alcoholism about 6 monts ago - he never talked about it when it was happening so I'm sure he was getting involved with her emotionally at that stage probably even without her knowledge). She lives in the city (Brooklyn), I know her first name and I have her cell number. That's all. I am assuming she is single (I still have part of trust in my H that he would not get involved with married woman because he sees that R as hope to stop his pain and what hope can there be if she is unavailable for the long run? Unless she is planning to D herself).
I don't realy know how to get more info on her. I could call his co-workers but they would tell him about it, I don't know anybody there that would be just on "my side".