Was I too passive in this WA/WB situation? Can I call this river?

[iheartponeez]

Villain is 42/8/5.5 over only 12 hands.

$0.25/$0.5 No Limit Holdem
6 players
Converted at weaktight.com

Stacks:
UTG (<font color="#0000cc">$19.45</font>)
UTG+1 (<font color="#0000cc">$44.00</font>)
CO (<font color="#0000cc">$66.25</font>)
BTN (<font color="#0000cc">$28.95</font>)
SB (<font color="#0000cc">$24.20</font>)
Hero (<font color="#0000cc">$59.25</font>)

Pre-flop: ($0.75, 6 players) Hero is BB 9[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/heart.gif[/img]
UTG calls $0.5, UTG+1 calls $0.5, CO calls $0.5, <font color="#777777">1 fold</font>, SB calls $0.25, Hero checks

Flop: 4[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/heart.gif[/img] ($2.5, 5 players)
SB checks, Hero checks, <font color="#cc0000">UTG bets $2</font>, <font color="#777777">2 folds</font>, <font color="#777777">SB folds</font>, Hero calls $2

Turn: A[img]/images/graemlins/heart.gif[/img] ($6.5, 2 players)
Hero checks, <font color="#cc0000">UTG bets $5.5</font>, Hero calls $5.5

River: K[img]/images/graemlins/spade.gif[/img] ($17.5, 2 players)
Hero checks, <font color="#cc0000">UTG bets $3.5</font>

Title sez it: I felt pretty lose since I was just trying to get to an easy showdown.