Someone's Dying in the Pretty Little Liars Finale, but Who?!

We still don't know who "A.D." is, but we do know that they are very likely going to die. How could they possibly live on? The point of the ending is to get closure, to finally put all this madness in the past. There's always a chance "A.D." will get arrested and go to prison, but the best closure comes from death. We have a feeling "A.D." won't make it out of this alive.