Some middle pair checkups. ATo, Party 1/2

[Dagger78]

MP is unknown.
Button is a 40/0/1.7 over 38hands. of 18 flops, he took 39% to showdown.

Party Poker 1/2 Hold'em (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is BB with T[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, MP calls, <font color="#666666">1 fold</font>, Button calls, SB completes, Hero checks.

Flop: (4 SB) T[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, MP folds, Button calls, SB folds.

Turn: (3 BB) 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, Button calls.

River: (5 BB) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, Hero folds.

Final Pot: 8 BB

[Leader]

seems fine

[Dagger78]

Since that river completes the straight and flush draws, and merit in NOT betting? Would a Check/call be better?