$25 TPTK value on the river?

[bozzer]

<font color="blue">CO villain is a loose passive fish, 50/14/2ish over a 30 hand sample.
immediately prior to this hand stacked off with QQ&lt;KK AIPF</font>


5 players
Converted at weaktight.com

~100bb eff stacks.

Pre-flop: ($0.35, 5 players) Hero is SB K[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/heart.gif[/img]
UTG calls $0.25, CO calls $0.25, BTN calls $0.25, <font color="#cc0000">Hero raises to $1.5</font>, <font color="#777777">1 fold</font>, UTG calls $1.25, CO calls $1.25, <font color="#777777">BTN folds</font>

Flop: 4[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/heart.gif[/img] ($5, 3 players)
Hero checks, UTG checks, CO checks

Turn: A[img]/images/graemlins/diamond.gif[/img] ($5, 3 players)
<font color="#cc0000">Hero bets $4</font> ($19.50), <font color="#777777">1 fold</font>, CO calls $4 ($19.55)

River: 5[img]/images/graemlins/heart.gif[/img] ($13, 2 players)
hero's action?