River move against TAG, +EV or Chip Spewing?

[KowCiller]

Villain seems to be a semi-smart TAG and possible 2+2'er. His PT stats are 16/4 over 100 hands. The only goofy thing he does is min-raise somewhat often preflop. I've played with him for 3 or 4 orbits and I haven't seen him do anything stupid (besides PF minraises). I've got a TAG image at this table and I've only shown down strong hands.

All thoughts appreciated on all streets.

Party Poker No-Limit Hold'em, $0.5 BB (8 handed) converter

saw flop|<font color="#C00000">saw showdown</font>

BB ($17.5)
UTG ($85.55)
UTG+1 ($24.5)
Villain ($40.35)
Hero ($55.06)
CO ($21.15)
Button ($46.3)
SB ($101.9)

Preflop: Hero is MP2 with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Villain raises to $1</font>, <font color="#CC3333">Hero raises to $3</font>, <font color="#666666">4 folds</font>, Villain calls $2.

Flop: ($6.75) 6[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Villain checks, Hero checks.

Turn: ($6.75) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Villain bets $4</font>, Hero calls $4.

River: ($14.75) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Villain bets $5</font>, <font color="#CC3333">Hero raises to $15</font>