50NL: Draw spikes TP on river, but facing big river bet

[Vyse]

No real reads; recently sat down at the table an orbit ago.

Full Tilt Poker - No Limit Hold'em Cash Game - $0.25/$0.50 Blinds - 6 Players - (LegoPoker HH Converter)

SB: $54.75
BB: $34.30
UTG: $53.05
MP: $22.75
Hero (CO): $49.75
BTN: $16.00

Preflop: Hero is dealt A[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] (6 Players)
2 folds, <font color="red">Hero raises to $2.00</font>, 2 folds, BB calls $1.50

Flop: ($4.25) K[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">BB bets $3.00</font>, Hero calls $3.00

Turn: ($10.25) A[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">BB bets $6.00</font>, Hero calls $6.00

River: ($22.25) 9[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">BB bets $19.00</font>, Hero calls $19.00

Pot Size: $60.25 ($3 Rake)