He didn't kill him. Remember when the snake lady was being possed by Lodes and wrote on the mirror that Sophie is the Omiga? Sophie is the evil version of Hawkins and was healing her daddy in the corn field.
As far as I know that was the season finale, and the door is wide open for good vs. evil next season. But I thought they lost a lot of the story with the entire Carnival finding out the truth about Hawkins. Now it just seems like it's going to be the standard good vs. evil crap. But then have to keep in mind it's HBO and their shit owns.
Lots of possibilities, Justin isn't dead, Sophie is realizing who she really is, they started to re-introduce Lodes back into it.
Damn good show, but now it's time for the Sapranos!