[Zoelef]

I think the river Ace makes checking through a safer choice because the board didn't improve your hole cards and almost certainly improved the villain's (unless he has KQ*, given UTG raise). Logical?

Edit: I had a similar hand on TGC .50/1 yesterday:

I have 99 in MP2. Villain is UTG+1, no reads.
Villain calls, I raise, Villain calls.

Flop: J-Q-x rainbow
Villain checks, I bet, Villain calls.

Turn: Rag
Villain checks, I bet, Villain calls.

River: A (no 3-flush on board)
Villain checks, I check.
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*JJ made straight on the turn, brain hurt bad