AKs flopped TPTK+NFD OOP, turn "bricks"

[kerplunkNL]

Have no idea what UTG's minraise means. Only played 20 hands with him. BB is not very good, 57/7 over 40 hands. Stacked him earlier when I flopped the nutflush and he turned a twopair.

First I want to know what to do on the turn here.

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

Button ($30.81)
Hero ($80.61)
BB ($23.88)
UTG ($52.76)
MP ($24.30)
CO ($33.41)

Preflop: Hero is SB with A[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">UTG raises to $0.5</font>, <font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $1.75</font>, BB calls $1.50, UTG calls $1.25.

Flop: ($5.25) 4[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $3.5</font>, BB calls $3.50, UTG calls $3.50.

Turn: ($15.75) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero..?