Flush On Paired Board Facing River Overbet

No reads on villian. I'm playing pretty tight so far. Only been at the table for like 25 hands.

GAME #596156079: Texas Hold'em NL $1.00/$2.00 2007-07-09 18:59:03
Table Cabanas
Seat 1: TheDiamond1 ($230.75 in chips)
Seat 3: cyberlion ($197.00 in chips)
Seat 5: GonnaCall ($203.10 in chips) DEALER
Seat 6: KMc ($256.00 in chips)
Seat 10: Hero ($260.50 in chips)
KMc: Post SB $1.00
Hero: Post BB $2.00
*** HOLE CARDS ***
Dealt to Hero [8h, Jh]
TheDiamond1: Fold
cyberlion: Fold
GonnaCall: Fold
KMc: Call $1.00
Hero: Check
*** FLOP *** [Th, 3h, 6h] (pot = $4)
KMc: Check
Hero: Bet $4.00
KMc: Call $4.00
*** TURN *** [Qd] (pot = $12)
KMc: Check
Hero: Bet $12.00
KMc: Call $12.00
*** RIVER *** [6c] (pot = $36)
KMc: Bet $44.00
Hero...

i call.