Call river with 44 (on board), Ace Kicker v. strength in 9.75 BB pot?

Only played 20 hands with Villain. 23.1/0/1.29. Seemed like a reasonable player.

What should I do on the river? My natural inclination with 9.75 BB at stake is to call -- I only have to win 10% of the time to make a call here correct. But is a call just silly in this particular situation?

Also, any thoughts on the previous streets are appreciated. (I thought I had odds to call both flop and turn -- please let me know if was wrong).

Party Poker 1/2 Hold'em (9 max, 9 handed) converter

Preflop: Hero is MP1 with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, MP3 calls, CO calls, <font color="#666666">2 folds</font>.

Flop: (7.50 SB) 4[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, MP3 calls, <font color="#CC3333">CO raises</font>, Hero calls, MP3 calls.

Turn: (6.75 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, MP3 checks, <font color="#CC3333">CO bets</font>, Hero calls, MP3 folds.

River: (8.75 BB) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">CO bets</font>, Hero ???

Will answer back in the a.m. (well, I mean later in the a.m.)