AK c/red on turn

Villain is new to the table and seems to be a solid tagg, is this really weak?

One orbit earlier i reraised his button raise in bb with JJ and he folded

***** Hand History for Game 5173205797 *****
$100 NL Texas Hold'em - Thursday, September 14, 23:03:13 ET 2006
Table Monster #1293940 (Real Money)
Seat 3 is the button
Total number of players : 6
Seat 4: choke299 ( $397.32 )
Seat 2: AATrain01 ( $171.40 )
Seat 3: Beardled ( $99.50 )
Seat 5: xnerd00x ( $100.50 )
Seat 1: vivabepo ( $42.45 )
Seat 6: RocketRotary ( $100 )
xnerd00x posts small blind [$0.50].
RocketRotary posts big blind [$1].
** Dealing down cards **
Dealt to AATrain01 [ Kh Ah ]
vivabepo folds.
AATrain01 raises [$4].
Beardled folds.
xnerd00x calls [$3.50].
RocketRotary folds.

** Dealing Flop ** [ Kd, 4c, 7h ]
xnerd00x checks.
AATrain01 bets [$6].
xnerd00x calls [$6].
** Dealing Turn ** [ 4s ]
xnerd00x checks.

AATrain01 bets [$12].
xnerd00x raises [$45].

AATrain01 folds.

he probably just saw a spot where he thought you were weak and made a play. the $12 into ~$20 does let him see you as weak there. if you want to lead turn, make it $20ish. a solid TAG isn't gonna call you PF w/ 4junk from the SB. He might have 77, but I think he makes a smaller CR (if any at all, smooth call is also likely) with a turned boat in that case. i think you're ahead here. if you don't want to play a big pot w/ AK OOP then checking turn behind is fine.