200NL Betting all the way to fold on river. mistake?

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Hello, I'm playing some NL after only playing limit in the past. In this hand the UTG guy is a rock at 16/2 and I'm not sure about the SB. Comments on all streets welcome. Should I have called the river? Blocking bet on river maybe?


Poker Stars, $1/$2 PL Hold'em Cash Game, 9 Players
LegoPoker Hand History Converter

CO: $148.95
BTN: $109.20
SB: $283.25
Hero (BB): $199.70
UTG: $200
UTG+1: $82.20
UTG+2: $80.15
MP1: $201
MP2: $127.30

Pre-Flop: K[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BB)
UTG calls $2, 3 folds, MP2 calls $2, CO folds, BTN calls $2, SB calls $1, Hero checks

Flop: ($10) 8[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/spade.gif[/img] (5 Players)
SB checks, <font color="red">Hero bets $9.50</font>, UTG calls $9.50, 2 folds, SB calls $9.50

Turn: ($38.50) 3[img]/images/graemlins/heart.gif[/img] (3 Players)
SB checks, <font color="red">Hero bets $25</font>, UTG calls $25, SB calls $25

River: ($113.50) 4[img]/images/graemlins/spade.gif[/img] (3 Players)
SB checks, Hero checks, <font color="red">UTG bets $79</font>, 2 folds

Results: $113.50 Pot ($3 Rake)
UTG mucked and WON $110.50 (+$74 NET)