$11 20k guaranteed, raise river?

[mflip]

Villain is pretty awful. He checked all 3 streets after turning the nut flush a couple orbits before this. Got his chips when he completed 44 in the SB flopped a set and got it in on the flop after he bet/min3bet and got 4bet.

PokerStars No-Limit Hold'em Tourney, Big Blind is t50 (9 handed) internettexasholdem.com

UTG+1 (t2455)
MP1 (t2065)
MP2 (t4050)
MP3 (t5090)
CO (t4545)
Hero (t2695)
SB (t3905)
BB (t6840)
UTG (t6805)

Preflop: Hero is Button with K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">6 folds</font>, <font color="#CC3333">Hero raises to t200</font>, <font color="#666666">1 fold</font>, BB calls t150.

Flop: (t425) 9[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero checks.

Turn: (t425) A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t300</font>, BB calls t300.

River: (t1025) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets t300</font>, Hero ??