I'm not sure it would be useful to tell him what you know. I have a feeling that he would find some way to turn it around, and make it your fault. It will be your fault that you opened the statement... how could you!
But don't forget what you know, you never know when it might be useful. As far as who the debt belongs to, it may well depend on the state. Here in AZ, it would be community debt, but in a non-community property state, that might not be so true. You need to talk to that lawyer!
