I want to say first I don't like the actions of any of the Anthony's over the last four years - but if we aren't privy to whatever this is he may or may not have done - how do we know it happened.
IMO he was the one person in the family who questioned her from the very beginning and the first to know she was guilty. We have no information to say otherwise. We do have information that says he was never in any danger of being charged with anything except "out there" in the urban legends about this case.
But I would happily read a link or two that may change my mind if you would provide them?
There were many conversations at the time as to what Lee had done that would require immunity before he made a statement. Here is one quote from his own atty that comes to mind. I will look for some more. His atty said at one time he expected he would be charged with obstructing justice for tampering with evidence- I remember that clearly. He obviously needed immunity for SOMETHING, but we will never know those details now.
http://www.wesh.com/Lee-Anthony-s-A...ged/-/11788876/13172032/-/lvvm5d/-/index.html