55s post flop ak

[gintron]

PartyPoker $55 Speed Tournament, Big Blind is t40 (10 handed) Converter on pregopoker.com

UTG (t2000)
UTG+1 (t2000)
MP1 (t2000)
MP2 (t2000)
MP3 (t2000)
CO+1 (t2000)
CO (t2000)
Hero (t2000)
SB (t2000)
BB (t2000)

Preflop: Hero is in Button with A[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img]
<font color="gray">UTG folds</font>, <font color="gray">UTG+1 folds</font>, <font color="gray">MP1 folds</font>, <font color="gray">MP2 folds</font>, <font color="gray">MP3 folds</font>, CO+1 calls t40, <font color="gray">CO folds</font>, <font color="red">Hero raises to t160</font>, <font color="gray">SB folds</font>, BB calls t120, CO+1 calls t120

Flop: (t500) A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] (3 players)
BB checks, CO+1 checks, Hero checks

Turn: (t500) 9[img]/images/graemlins/spade.gif[/img] (3 players)
<font color="red">BB bets t150</font>, <font color="gray">CO+1 folds</font>, Hero calls t150

River: (t800) 2[img]/images/graemlins/diamond.gif[/img] (2 players)
<font color="red">BB bets t150</font>, Hero calls t150

Question is mainly on turn, raise for free showdown or just call down barring non scary river? As played, you think im good on river 1 in 6? I really don't think he HAS to have a diamond here.