10NL: KsQd on 4 diamond flop, facing river bet

[Wilpro]

Villain is about 35/25 over 80 hands
Prob my toughest decision from today, thoughts appreciated on all streets.

Poker Stars, $0.05/$0.10 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter

Hero (BTN): $11.65
SB: $11.70
BB: $21.15
UTG: $19.80
MP: $10.65
CO: $14.95

Pre-Flop: K[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BTN)
2 folds, CO calls $0.10, <font color="red">Hero raises to $0.50</font>, SB folds, BB calls $0.40, CO calls $0.40

Flop: ($1.55) K[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] (3 Players)
BB checks, CO checks, <font color="red">Hero bets $1.20</font>, BB calls $1.20, CO folds

Turn: ($3.95) 3[img]/images/graemlins/diamond.gif[/img] (2 Players)
BB checks, Hero checks

River: ($3.95) J[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">BB bets $2.50</font>, Hero folds

Results: $3.95 Pot ($0.15 Rake)
BB mucked and WON $3.80 (+$2.10 NET)