50 NL 6-max - Tough river call against super LAG

[YKMM]

CO is 93/14/2.5 in 40 hands. Three-betting minbet tendencies is unknown. Maybe I should have blocked the river. As I've played, should I call or fold river?

Poker Stars
No Limit Holdem Ring game
Blinds: $0.25/$0.50
5 players
Converter (http://www.neildewhurst.com/hand-converter)

Stack sizes:
Hero: $47.50
CO: $45.70
Button: $51.35
SB: $62.15
BB: $45

Pre-flop: (5 players) Hero is UTG with A/images/graemlins/spade.gif T/images/graemlins/diamond.gif
<font color="#cc0000">Hero raises to $2</font>, <font color="#cc0000">CO raises to $3.5</font>, 3 folds, Hero calls.

Flop: K/images/graemlins/diamond.gif 6/images/graemlins/club.gif A/images/graemlins/heart.gif ($7.75, 2 players)
Hero checks, <font color="#cc0000">CO bets $2.5</font>, Hero calls.

Turn: 8/images/graemlins/diamond.gif ($12.75, 2 players)
Hero checks, CO checks.

River: 7/images/graemlins/club.gif ($12.75, 2 players)
Hero checks, <font color="#cc0000">CO bets $14</font>, Hero .....

[Waingro]

Really easy call. And well played I might add.

[Sir Winalot]

The river bet is really weird, smells like an overbet bluff to me. I call. Also I fold preflop to the 3-bet.