100NL: AK TPTK, call river?

[Lurker.]

Villain is pretty bad (27/10/1) and i had just taken him for half a stack the hand before (all he had in front at the time) so it's possible he's tilting....so call? If call why, if fold, why? Any better lines? Is anyone checking this flop? Thanks.

Full Tilt Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 6 Players - (LegoPoker Hand History Converter)

Hero (SB): $191.10
BB: $114.45
UTG: $116.20
MP: $335.10
CO: $98.50
BTN: $100.00

Preflop: Hero is dealt A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/spade.gif[/img] (6 Players)
3 folds, <font color="red">BTN raises to $3.50</font>, <font color="red">Hero raises to $13.00</font>, BB folds, BTN calls $9.50

Flop: ($27) 4[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $18.00</font>, BTN calls $18.00

Turn: ($63) 8[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, BTN checks

River: ($63) K[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets all-in for $69.00</font>, Hero?