River decision after strange play by opponent

[Fantam]

Villain was about 28/19/2.7 after small sample of 21 hands.
Anyway his play was strange, because he checked a blank river after check/raising the turn.

PokerStars 0.50/1.00 Hold'em (10 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is UTG+2 with J[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">UTG raises</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">6 folds</font>, BB calls, UTG calls.

Flop: (9.50 SB) 5[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, UTG checks, <font color="#CC3333">Hero bets</font>, BB calls, UTG calls.

Turn: (6.25 BB) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">UTG bets</font>, <font color="#CC3333">Hero raises</font>, BB folds, <font color="#CC3333">UTG 3-bets</font>, Hero calls.

River: (12.25 BB) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, Hero...?

What would your plan for the river be ?