AQo in MP against a tight UTG limper

[Fiddler]

UTG is around 19/9 pre-flop over 70 hands. He hasn't done anything strange that I have seen, except limping UTG. The rest of the table consists of me, another tight dude and three very loose players.

I have AQo in MP.

UTG limps, I raise and everyone else folds.

Flop: A 9 5 rainbow.

UTG checks, I bet he calls.

Turn: 6 completing the rainbow.

UTG checks, I check.

River: 9

UTG bets, I raise, UTG 3-bets, I fold.