[Toro]

If CO has a set or a straight, he's not checking the River for fear you may check behind, so I eliminate those hands.

I think he started with 88 or JT, more likely JT because I don't think he limps preflop from the CO with 88.

He checked the flop after flopping top pair because you raised and he expected you to bet. Now on the turn, he's not crazy about the queen but feels he must bet. He calls the raise because he's got a "combination" hand, pair with straight draw.

He misses his straight on the River and checks. He's got to fear the Queen. You raised preflop with AJ, why couldn't you have AQ?

Now is the time to put the hammer down and fire that last bullet to convince him you have the queen. Push all-in.