[mattak]

My guess at hand range.
-set (88,44) he cant let go of. Board pairs on river, you are beat
-slow played A [img]/images/graemlins/heart.gif[/img],A (x). A decent player doesnt call your turn check raise but, no reads.
-A [img]/images/graemlins/heart.gif[/img], T (x) you are ahead and might get some value from his trips. Again, he probably shouldn't have called your check raise.
-higher flush, most likely holding IMHO. No A [img]/images/graemlins/heart.gif[/img] flush or he would have pushed turn.

bottom line: you are behind most of his range. He has approx. $100 behind on the river so he is felting any kind of hand and a blocking bet is out. I c/f river. I dont think he bets river with anything you can call.