50NL AA river decsion vs a maniac

[BevillTheDevil]

villian is 83/30/1.7 after 73 hands, villian has been playin complete out of control makein 200BB AI on 10BB pots, got all in on flop w/ Gutshot draw and hit the river...but i wasnt sure about his check raise here on the river, should i just check behind on the river here??

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

Stack sizes:
UTG: $89.41
CO: $352.60
Hero: $112.20
SB: $68.73
BB: $136.35

Pre-flop: (5 players) Hero is Button with A/images/graemlins/club.gif A/images/graemlins/diamond.gif
UTG folds, CO calls, <font color="#cc0000">Hero raises to $2.5</font>, 2 folds, CO calls.

Flop: 2/images/graemlins/heart.gif K/images/graemlins/club.gif 4/images/graemlins/club.gif ($5.75, 2 players)
CO checks, <font color="#cc0000">Hero bets $5</font>, CO calls.

Turn: 9/images/graemlins/spade.gif ($15.75, 2 players)
CO checks, <font color="#cc0000">Hero bets $13.5</font>, CO calls.

River: 6/images/graemlins/diamond.gif ($42.75, 2 players)
CO checks, <font color="#cc0000">Hero bets $26</font>, <font color="#cc0000">CO raises all-in $331.6</font>, Hero ?

[CaptUnlucky]

Ugh... this sucks, I think fold, but he sounds like such an idiot, this could easily be a bluff, which is the only thing we're beating.

It doesn't look like a draw though, he probably plays that faster on the flop...