Confused on the river with trips in a limped pot.....

[HoldEmNewby]

Villain was very loose and aggro 68/21

Party Poker, $0.50/$1 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter

BB: $99
UTG: $21.65
MP: $39.74
CO: $29.50
BTN: $131.76
Hero (SB): $141

Pre-Flop: 9[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/diamond.gif[/img] dealt to Hero (SB)
UTG folds, MP calls $1, CO calls $1, BTN folds, Hero calls $0.50, BB checks

Flop: ($4) 9[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/club.gif[/img] (4 Players)
<font color="red">Hero bets $2.50</font>, BB folds, MP calls $2.50, CO calls $2.50

Turn: ($11.50) 9[img]/images/graemlins/diamond.gif[/img] (3 Players)
<font color="red">Hero bets $10</font>, MP calls $10, CO folds

River: ($31.50) 7[img]/images/graemlins/club.gif[/img] (2 Players)
Hero??????? villain has 26 left