nl100 TPTK, value bet this river?

[Brimstead]

no accurate read on villain, only played ~20 hands, but he seems loose - limps into a lot of pots

Poker Stars, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

UTG: $69.25
MP: $55.40
Hero (CO): $45.40
BTN: $51.75
SB: $81.15
BB: $27.35

Pre-Flop: A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img] dealt to Hero (CO)
UTG calls $0.50, MP folds, <font color="red">Hero raises to $2.50</font>, BTN calls $2.50, 2 folds, UTG calls $2

Flop: ($8.25) 6[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/club.gif[/img] (3 Players)
UTG checks, <font color="red">Hero bets $6</font>, BTN folds, UTG calls $6

Turn: ($20.25) 2[img]/images/graemlins/diamond.gif[/img] (2 Players)
UTG checks, <font color="red">Hero bets $15</font>, UTG calls $15

River: ($50.25) J[img]/images/graemlins/diamond.gif[/img] (2 Players)
UTG checks, Hero ?

should i VB here or just check it down and hope to see a weaker king? KQ/KT might call here, KJ has me buried, as does 66...