400NL - fold KK overpair on turn ?

[Mat]

Villain is 24/14/1.5 (124h), we haven't tangled much but it seems like he's a pretty bad calling station (38% went to SD, 50% won). My image is around 23/19.

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

($389.60)
SB ($416.30) (Hero)
BB ($549.60)
SB ($885.80)

Preflop: Hero is SB with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img]
<font color="#CC3333">Hero raises to $14.00</font>, null calls $14.00, BB calls $14.00, <font color="#666666">2 folds</font>,

Flop: 6[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/club.gif[/img] ( $48 )
<font color="#CC3333">Hero bets $30.00</font>, <font color="#666666">1 folds</font>, BB calls $30.00,

Turn: 9[img]/images/graemlins/heart.gif[/img] ( $108 )
<font color="#CC3333">Hero bets $70.00</font>, <font color="#CC3333">BB raises to $318.00</font>,