KQs - pot turn?

[bank]

Party Poker No-Limit Hold'em, $ BB (6 max, 6 handed) pokerhand.org hand converter

MP ($399.40)
CO ($256.60)
Button ($429.90)
Hero ($425.60)
BB ($724.30)
UTG ($445.60)

Preflop: Hero is SB with Q[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img]. Hero posts a blind of $2.
UTG calls $4, MP calls $4, CO calls $4, <font color="#666666">1 fold</font>, Hero (poster) completes, BB checks.

Flop: ($20) 5[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Hero bets $18</font>, BB folds, UTG calls $18, MP folds, CO calls $18.

Turn: ($74) 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">UTG bets $55</font>, CO folds, Hero calls $55.

[AZK]

I'm most likely betting the turn again when I find myself in situations like this.

[Lucky]

You gotta bet turn. What are you behind? If he has monster, he'll let you know.

[bank]

[ QUOTE ]
You gotta bet turn. What are you behind? If he has monster, he'll let you know.

[/ QUOTE ]

Do you think he's capable of semi-bluff raising a flush/straight draw or weaker king here? If so, I could potentially get pushed off the best hand if I bet/fold this turn. Is this something I should worry about against a 400nl unknown? I'm not a NL player...was getting sick of limit so I played some NL today.