NL5, Trip kings vs shove?

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Villain is a typical nl5 player. He calls raises preflop with a2c. However i have no idea how he plays post flop.

PokerStars No-Limit Hold'em, $0.05 BB (5 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($2.74)
Hero ($5.67)
MP ($15.54)
Button ($10.15)
SB ($4.15)

Preflop: Hero is UTG with K[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">Hero raises to $0.2</font>, <font color="#666666">1 fold</font>, Button calls $0.20, <font color="#666666">1 fold</font>, BB calls $0.15.

Flop: ($0.62) 6[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, Hero checks, <font color="#CC3333">Button bets $0.15</font>, BB folds, Hero calls $0.15.

Turn: ($0.92) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $0.25</font>, Hero calls $0.25.

River: ($1.42) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $1.3</font>, <font color="#CC3333">Button raises to $9.55</font>, Hero ???

Maybe i should of raised the flop, and definitely the turn to see where i was at in the hand. I think he most likely has an ace here.

?