cold call 120bbs on riv?

[DaDizz]

2/4 full tilt poker

SB 32/5/2.5
BB 16/14/3.2 over 400 hands
dealt 4 [img]/images/graemlins/diamond.gif[/img],4 [img]/images/graemlins/heart.gif[/img]
PREFLOP: UTG limp, MP limp, CO limp, Hero limps, SB raises to 24, BB cc 24, all limps fold, I call

FLOP: A [img]/images/graemlins/diamond.gif[/img]K [img]/images/graemlins/spade.gif[/img]4 [img]/images/graemlins/club.gif[/img]

pot:$85
SB thinks and checks, BB checks, I check(I know now I should have bet but had a feeling something sketchy is going on from SB and check)

TURN: 9 [img]/images/graemlins/heart.gif[/img]

SB matches pot for $85, BB calls $85, I call $85

River: 5 [img]/images/graemlins/spade.gif[/img]

SB bets $160, BB raise allin, I have to call $480...Hero folds, SB folds

seemed as though SB was pot committed but folded...I put BB on precisely 99, believing he bets flop with AK