OOP against what looks like a value bet

[allaboutmyfetti]

no specific reads, players haven't done anything out of line in my time with them.
Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
5 players
Converter (http://www.neildewhurst.com/hand-converter)

Stack sizes:
UTG: $45.75
CO: $24.35
Button: $115.20
hero: $94.70
BB: $62.50

Pre-flop: (5 players) hero is SB with J/images/graemlins/spade.gif K/images/graemlins/spade.gif
UTG folds, <font color="#cc0000">CO raises to $1</font>, Button calls, hero calls, BB calls.

Flop: 2/images/graemlins/diamond.gif 2/images/graemlins/club.gif J/images/graemlins/club.gif ($4, 4 players)
hero checks, BB checks, <font color="#cc0000">CO bets $0.5</font>, Button calls, <font color="#cc0000">hero raises to $5</font>, BB calls, CO folds, Button calls.

Turn: 3/images/graemlins/diamond.gif ($19.5, 3 players)
hero checks, <font color="#cc0000">BB bets $5</font>, Button calls, hero calls.

River: 6/images/graemlins/heart.gif ($34.5, 3 players)
hero checks, BB checks, <font color="#cc0000">Button bets $15</font>, Hero ??

[Hail Eris]

It looks like a busted flush draw, too. What's he value betting here that he plays like this? 4c5c and not much else.

[larry the legend]

it does look like a busted flush draw....he didnt raise raise a small bet by CO (which he likely would have with AJ, AA, KK, QQ to find out where he was) if he has a busted flush draw 30% or so you are even EV

[Thrahl]

This is either air or 66. I'd call.