AK - TPTK on heavy board, value on the river?

[OMGJuliet]

Full Tilt No-Limit Hold'em, $0.25 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($35.20)
Button ($16.65)
Hero ($24.75)
BB ($31.70)
UTG ($10.60)
MP ($24.95)

Preflop: Hero is SB with A[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">CO raises to $0.5</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $1.95</font>, <font color="#666666">1 fold</font>, CO calls $1.35.

Flop: ($4.05) K[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $3.5</font>, CO calls $3.50.

Turn: ($11.05) Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $8</font>, CO calls $8.

River: ($27.05) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, CO checks.

Final Pot: $27.05

It is like my 2nd orbit, i haven't seen villain playing alot of hands, i have seen him only calling down the river with 88 on a xKxQx board, catching a bluff.
There were alot of draws out there and he also might be passively playing a twopair, especially after calling a big bet on the turn.
Is there value in betting the river? I thought no worse hand would be calling me, but I'm not sure, since he's the guy who probably won't like to be bluffed and will call riverbets with medium holdings. I don't think he'd call a J, maybe only AQ.

Try to range/read him, it was very hard for me putting him on a hand, that didn't beat me, but minraise/calls me preflop.