UTG is 63/7 with 40% fold to cbet. He min-3bet me earlier and psb flop and then another time minraised my cbet on a low board. My assumption in both spots was that he was very strong because they're the only times I've seen him do that. His aggression % is fairly high, more from donking OOP than from raising though, and the two times the PFR hasnt c-bet against him he's bet. I've seen him minbet/call, minbet, minbet with bottom pair on an A high board before. I was a bit tired, should have bet turn a bit bigger to make for a nice river, but the 5 sucks putting 4straight on the board. I just have no idea if he's capable of betting the river without an 8. I feel like if I shove I'm value towning myself, bet/call sucks, bet/fold seems terrible. I ended up deciding he's unlikely to bet without the straight, but cant say I really had that as a read. Thoughts?

No-Limit Hold'em, $1.00 BB (6 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

CO ($210.75)
Button ($103.60)
Hero (SB) ($126)
BB ($112.10)
UTG ($67.10)
MP ($110.15)

Preflop: Hero is SB with J, J
UTG calls $1, 3 folds, Hero bets $3.50, 1 fold, UTG calls $3

Flop: ($9) 9, 7, 6 (2 players)
Hero bets $6, UTG calls $6

Turn: ($21) Q (2 players)
Hero bets $12, UTG calls $12

River: ($45) 5 (2 players)
Hero checks, UTG bets $26.50, Hero folds

Total pot: $45