NL25 call river overbet with TPTK on paired board?

[chris216]

Villain just sat down 2 orbits ago. Looked a bit fishy so far. Played a lot of hands. But this line looks really like he has trips, wanted to check-raise the turn and then overbet river to make up for the missed check-raise.

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

SB ($4.40)
BB ($24.50)
UTG ($27.15)
MP ($22.50)
CO ($24.90)
Hero ($28.50)

Preflop: Hero is Button with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img].
UTG calls $0.25, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $1.25</font>, <font color="#666666">2 folds</font>, UTG calls $1.

Flop: ($2.85) J[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, <font color="#CC3333">Hero bets $2.25</font>, UTG calls $2.25.

Turn: ($7.35) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
UTG checks, Hero checks.

River: ($7.35) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets $8.5</font>, Hero folds.

Final Pot: $15.85