Derick did want off the show a season or two but they talked him into staying. But I feel like the most recent close call he experienced would have been at the end of the season instead if he was going to be killed off. JJ could be a possibility. They have had several awkward touchy-feely moments between her and Reid... which I guess could mean it's Reid. LOL. So now I'm back to several options. If I had to pick someone to go, I would prefer Reid on an emotional level because he doesn't have a family. But I'd miss him for sure. Penelope would also be okay with me. If they have to do it
I refuse to believe that it could be Derek or Penelope, because the show would not be the same without their interactions.
Their scenes in the Derek episode could be possible foreshadowing, though.