While the Justified showrunners don't know exactly how the FX series is going to end (even though they're currently writing the penultimate episode now!), executive producer Graham Yost has a general idea.
"The very end of the series, the end of season six, Raylan [Tim Olyphant] and Boyd [Walton Goggins] have their final showdown and dot dot dot!" Yost tells E! News. "That's all I'm going to say. Everyone knows it's going to come down to them. It has to and it will."