AK 3way on paired board

[KCrow]

No reads on the CO - looks like your average TAG. I didn't Cbet this flop as full tilt was glitching up. As played call or raise?

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

MP: $50.75
CO: $60.30
BTN: $76.65
SB: $51.20
BB: $10.15
Hero (UTG): $58.50

Pre-Flop: K[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/club.gif[/img] dealt to Hero (UTG)
<font color="red">Hero raises to $1.75</font>, MP folds, CO calls $1.75, 2 folds, BB calls $1.25

Flop: ($5.50) 6[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/heart.gif[/img] (3 Players)
BB checks, Hero checks, CO checks

Turn: ($5.50) A[img]/images/graemlins/heart.gif[/img] (3 Players)
BB checks, <font color="red">Hero bets $4</font>, CO calls $4, <font color="red">BB raises to $8.40 and is All-In</font>, <font color="red">Hero.........