$11 140 flopped straight - how did i play this?

[qwertyui9]

Hey all, first post on this board so take it easy on me! Ive recently started playing online mtts a bit more seriously and had this hand come up today.

Im looking back at this now thinking this I was too passive all the way through the hand. I had seen the villain bet small on all streets like this before but had not seen any hands. What do you think of the play of the hand and what do you do on the river?

Holdem No Limit 800/1,600
Seat 1 : $4,020
Seat 2 : $6,695
Button $3,720
Villain $33,590
Hero $16,990
Seat 6 : $50,240
Seat 7 : $1,470
Seat 8 : $11,300
Seat 9 : $40,810

Villain posted small blind (800)
Hero posted big blind (1600)

Hero has K [img]/images/graemlins/club.gif[/img] T [img]/images/graemlins/heart.gif[/img]

folded to villain:

Villain called 800
Hero checked.
Board cards [J [img]/images/graemlins/heart.gif[/img] A [img]/images/graemlins/spade.gif[/img] Q [img]/images/graemlins/spade.gif[/img]]
Villain bet 1,600
Hero called 1,600
[Board cards [J [img]/images/graemlins/heart.gif[/img] A [img]/images/graemlins/spade.gif[/img] Q [img]/images/graemlins/spade.gif[/img] 6 [img]/images/graemlins/spade.gif[/img]]
Villain bet 3,200
Hero called 3,200
Board cards [J [img]/images/graemlins/heart.gif[/img] A [img]/images/graemlins/spade.gif[/img] Q [img]/images/graemlins/spade.gif[/img] 6 [img]/images/graemlins/spade.gif[/img] Q [img]/images/graemlins/club.gif[/img]]
Villain bet 3,200
Hero ?