100NL: Is this worth a river bet?

[funneldave]

Villain hasnt been sat down long, and is unknown. I am at 18/11.
I C-bet the flop and was going to fold to a turn bet, but his check behind threw me, what is his range here? Tried a bet on the end to see a cheap showdown, raise made it an easy fold. Should I be c/f river?

Party Poker, $0.50/$1 NL Hold'em Cash Game, 9 Players
LeggoPoker.com - Hand History Converter

SB: $98.09
BB: $78.54
UTG: $21.50
UTG+1: $104.20
Hero (UTG+2): $100.73
MP1: $115.93
MP2: $20
CO: $18.50
BTN: $50.55

Pre-Flop: 6[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/heart.gif[/img] dealt to Hero (UTG+2)
2 folds, <font color="red">Hero raises to $4</font>, MP1 calls $4, 5 folds

Flop: ($9.50) 4[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $7</font>, MP1 calls $7

Turn: ($23.50) 5[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, MP1 checks

River: ($23.50) 7[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $14</font>, <font color="red">MP1 raises to $28</font>