big fold on the river

[future]

Not a hand of mine personally, but of someone I was observing. I liked the action but maybe check the river? Comments? *NOTE: 5.50 BUYIN*

PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (6 handed) converter

UTG (t2930)
MP (t855)
CO (t2220)
Button (t820)
SB (t4288)
Hero (t2387)

Preflop: Hero is BB with 5[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, CO calls t100, <font color="#666666">2 folds</font>, Hero checks.

Flop: (t250) 5[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t150</font>, CO calls t150.

Turn: (t550) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets t100</font>, <font color="#CC3333">Hero raises to t350</font>, CO calls t250.

River: (t1250) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t500</font>, <font color="#CC3333">CO raises to t1620</font>, Hero folds.

Final Pot: t3370