My Fox Orlando is reporting today that there's talk Lee Anthony may face criminal charges as well as his sister, Casey Anthony: "Casey Anthony's Brother Could Also Face Charges." They are reporting it's gonna be "aiding and abetting" or "obstruction of justice."
Personally, I think this is just rumor right now. And, while there are folk that think Casey Anthony had to have an accomplice, I don't know that Lee Anthony would fit that role.
From the videos and interviews that I've seen, it looked like Lee Anthony was undertaking his own informal investigation into Caylee's whereabouts -- and if there's anything to this rumor, I'm betting it has something to do with Lee acting as an "investigator" in this case and getting in the way of the law enforcement authorities.