No read on CO (only that he has a full stack, for what its worth).
(accidentally butchered hand history, anyway I have A K )

Wondering about every street but preflop (thoughts at the end)

Preflop (Pot:0.75)
Player 4****FOLD
Player 5****FOLD
Player 6****RAISE $1.5
Hero****RAISE $5
Player 2****FOLD
Player 3****FOLD
Player 6****CALL $3.5

Flop(Pot: $10.75)
***

Player 6****CHECK
Hero****CHECK

Turn(Pot: $10.75)
****

Player 6****BET $5
Hero****CALL $5

River(Pot: $20.75)
*****

Player 6****CHECK
Hero****BET $13.5


Pre is standard, 3betting ak
On the flop I thought, I'm not getting any pair 8 or higher to fold on this flop... Probably not his AK either, or KQ (straight draw). Betting doesn't seem to achieve much but fold AQ/charge KQ. So I just checked behind.

On the turn, I thought he might be trying to steal it after I checked back, with one of those broadway hands. If he isn't, I have 4 clean outs for the nuts, and I have 6 outs for TPTK, which might be good. Just AK high might be good too. So I called.

When he checked on the river... Well, whether he has me beat or not, the 9 scared him, because he's not value betting/bluffing anymore.

If he has AQ/QQ here he's probably betting... Not checking to induce, after I checked flop behind and just called turn. So I figure I can push him off his AK, or his one pair/two pair type hand. Maybe even his sets. I could have AQ or KQ here, after floating turn.
Should I have bet bigger?
Or not bet at all? (Turn is a call right?)

Board: 8TJ*5
*******Equity*****Win*****Tie
UTG****57.38%**57.38%***0.00%*{ QQ-88, AQs-AJs, KJs+, QJs, JTs, AQo-AJo, KQo }
UTG+1**42.62%**42.62%***0.00%*{ AcKd }

Above for turn

OTR if you are correct about him checking all non qx he will have so many bluffcatchers it just comes down to is he a believer or not and that is population read, you do have a face up value range.