1/2, standard river b/f?

[Jim14Qc]

No reads on villain, no stats yet so he's new at the table and I haven't mined / played with him.

Standard bet/fold river? Does he like always have a 4 or AK here (4 more likely)?

Full Tilt Poker - No Limit Hold'em Cash Game - $1/$2 Blinds - 6 Players - (LegoPoker HH Converter)

SB: $205.35
BB: $156.80
UTG: $200.00
MP: $210.55
CO: $191.55
Hero (BTN): $258.20

Preflop: Hero is dealt A[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/spade.gif[/img] (6 Players)
3 folds, <font color="red">Hero raises to $7.00</font>, SB folds, BB calls $5.00

Flop: ($15) 4[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/heart.gif[/img] (2 Players)
BB checks, <font color="red">Hero bets $11.00</font>, BB calls $11.00

Turn: ($37) A[img]/images/graemlins/spade.gif[/img] (2 Players)
BB checks, <font color="red">Hero bets $28.00</font>, BB calls $28.00

River: ($93) 9[img]/images/graemlins/club.gif[/img] (2 Players)
BB checks, <font color="red">Hero bets $45.00</font>, <font color="red">BB raises to $90.00</font>, Hero folds
Uncalled bet of $45.00 returned to BB

Pot Size: $183.00 ($3 Rake)