10+1 MTT: Does Villain have to beat King high straight here?

[TPTK77]

I had sat two orbits at this table and villain did not have any plays that were out of line. I know my hand isn't strong enough here on the river to call, but I'm wondering with villain's pot size bet on the river, does he have to beat Kx for a straight when the board pairs on the river. I bet on the turn to represent the King, but he instacalled my bet. I'm thinking at this point, he has some two pair combination. What do you guys all think?


Poker Stars, $10 + $1 NL Hold'em Tournament, 25/50 Blinds, 8 Players
LeggoPoker.com - Hand History Converter

BB: 10,470
UTG: 2,145
UTG+1: 3,315
MP1: 4,645
MP2: 4,870
CO: 6,525
Hero (BTN): 5,790
SB: 2,650

Pre-Flop: (75) J[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BTN)
2 folds, <font color="red">MP1 raises to 150</font>, MP2 calls 150, CO folds, Hero calls 150, 2 folds

Flop: (525) 9[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/club.gif[/img] (3 Players)
<font color="red">MP1 bets 200</font>, MP2 folds, Hero calls 200

Turn: (925) J[img]/images/graemlins/club.gif[/img] (2 Players)
MP1 checks, <font color="red">Hero bets 400</font>, MP1 calls 400

River: (1,725) 9[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">MP1 bets 1,550</font>, Hero ????