AK hits but facing heat

[As armas]

This previous hand vs villain in same session for background:

Full Tilt Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 5 Players - (LegoPoker Hand History Converter)

Hero (SB): $102.90
BB: $95.30
UTG: $99.50
CO: $189.95
BTN: $127.60

Preflop: Hero is dealt J[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img] (5 Players)
3 folds, <font color="red">Hero raises to $4.00</font>, BB calls $3.00

Flop: ($8) K[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $6.00</font>, BB calls $6.00

Turn: ($20) 9[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $12.00</font>, BB calls $12.00

River: ($44) 7[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, BB checks

Pot Size: $44.00 ($2.20 Rake)

BB had J[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/heart.gif[/img] (two pair, Kings and Sevens) and WON (+$19.80)
Hero had J[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img] ([Jc Js] two pair, Jacks and Sevens) and LOST (-$22.00)
ok onto my lovely AK hand vs him:

Full Tilt Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $98.50
BB: $191.45
UTG: $129.10
Hero (MP): $100.00
CO: $114.60
BTN: $98.50

Preflop: Hero is dealt A[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/diamond.gif[/img] (6 Players)
UTG folds, <font color="red">Hero raises to $3.50</font>, CO calls $3.50, BTN calls $3.50, 2 folds

Flop: ($12) Q[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] (3 Players)
<font color="red">Hero bets $8.00</font>, <font color="red">CO raises to $20.00</font>, BTN folds, Hero calls $12.00

Turn: ($52) 3[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $50.00</font>, Hero?
Pot Size: $52.00 ($2.60 Rake)

He insta bet the fifty. Now based on the previous hand I figured this is not KJ or worse. But then I thought, he saw me bet the flop and turn before without even top pair, so perhaps he just doesnt respect me now. His PAHUD numbers were pretty standard. Thoughts?

[Hosehound25]

Pretty easy fold IMO. I think you are chopping at best, but usually see KQ here. You are hardly ever ahead here especially given the fact its a rainbow flop, and hence there are no combo draws.

[Jay Riall]

Yeah, fold turn.

[spivey]

Don't try to overanalyze the previous bvb situation's affect on this hand. This is KQ or 44 almost always.