I agree with the others here Messedup.
Back in the day, one of my friends robbed a drug dealer, and he needed a place to hide while he was "on the run". I allowed him (and the stash) to hide at my house for a few days. Why? Because I wanted to help - oh, yeah, and also take a nice cut of the stolen drugs for myself. And now I was just as guilty and no different than the thief. Trust me, these things do not end well. I know your friend is on the other side of things, but there will be no positive outcome for you if you get involved.
In your situation, you need to distance yourself from this situation at all costs. This is NOT your problem and - friend or not - these are the type of people you need to stay away from moving forward. Leave it alone, don't get involved, and walk the other way.