Bet/fold on turn w/ over pair?

[Laetus]

Villain is unknown to me. Fine to bet/fold turn or is someone bet/calling? What if turn was 2 [img]/images/graemlins/spade.gif[/img]?

Everest Poker No-Limit Hold'em, $2.00/$4.00 (HH Converter by Kreatief)

CO ($457.50)
Button ($80.80)
SB ($387.40) (Hero)
BB ($400.00)
MP2 ($305.40)
MP3 ($480.50)

Preflop: Hero is SB with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/diamond.gif[/img]
<font color="#666666">1 folds</font>, MP3 calls $4.00, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $20.00</font>, BB calls $16.00, MP3 calls $16.00,

Flop: Q[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] ( $62 )
<font color="#CC3333">Hero bets $44.00</font>, <font color="#666666">1 folds</font>, MP3 calls $44.00,

Turn: J[img]/images/graemlins/club.gif[/img] ( $150 )
<font color="#CC3333">Hero bets $105.00 and plan to fold against a raise?</font>