Bottom end of str8 shrinks up.

[Silly String]

Villain is a solid TAG player. He bets smallish with TP. Nothing out of line yet.
I've been running so bad lately the river decision was really tough. Would he bet this without a T? Do you call this?

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP ($99.50)
CO ($22.80)
Button ($124)
Hero ($140.20)
BB ($93.50)
UTG ($78.25)

Preflop: Hero is SB with 7, 6.
UTG calls $1, 1 fold, CO calls $1, 1 fold, Hero completes, BB checks.

Flop: ($4) 9, J, 5 (4 players)
Hero checks, BB checks, UTG bets $1, CO calls $1, Hero calls $1, BB calls $1.

Turn: ($8) 8 (4 players)
Hero checks, BB checks, UTG bets $2, CO folds, Hero raises to $10, BB folds, UTG calls $8.

River: ($28) Q (2 players)
Hero checks, UTG bets $10, Hero ????

[IowaSkinsFan]

I think he bets this enough with two pair or some random ass hand to call.

[dan]

easy call getting nearly 4:1

[freechus9]

Block the river, fold to a raise?

[Silly String]

I couldn't see anything but JT or 9T here. I have been running so bad lately I felt like a blocking bet was throwing away money. Given my CR I figure he would check behind with anything other than a T.
I think a blocking bet is the play here. You are right IA, 2pr bets this. Specifically J8 as that is what he showed.
I folded. That is the perfect case of running bad causing you to make less than optimal decisions.