Does seth clearwater die in breaking dawn part 2?

of course not!

(Correction)

In fact, in a vision that Alice gives Aro, the Volturi leader, Seth Clearwater, Leah Clearwater, Carlisle Cullen, and Jasper Cullen all dies, but ONLY in the vision she gives him. Also in the same vision the WHOLE Volturi group is completely wiped out. Edward and Bella kills Aro. Just as they are lighting Aro on fire Alice ends the vision.