Iris, if you don't know where he is, how can you ensure he goes to jail? It seems to me it's only a matter of time before the law catches up with him anyway, so why put yourself in that position?
You can't cure him - time and himself will or won't make that decision. I'm hearing a lot of absolutes - you can't do this, he can't do that, yet this isn't something you can control. Please concentrate on what you can do which is look after yourself and prepare for your baby is as calm as an atmosphere as you can create.
Do you have enough support, and what you need to bring the baby home? Stress isn't good for either of you. If you can, try to detach a little from your ABF's situation and make your environment calm. This may involve getting support from Nar-Anon.