Lee murdering the man who his wife cheated on him with. It seems weird that throughout the first four episodes (except for when you can hear Lee's dream in Episode 1) Lee has never really mentioned it much. I think the man could be after Lee for some reason. Also because he is staring at Lee when he buries the dead zombie child in Episode 4. I'm not really sure though since it would be a major coincidence that he has a walkie talkie that knows how to talk to Clementine's walkie talkie (which could mean he has come across Clementine's parents, who maybe have ANOTHER walkie talkie?) and that he is leading Clementine on to meet up with him in Savannah. I definitely think Lee's past will catch up to him in Episode 5 though. What do you think?