I'm a good tourney player, getting started in NL. Please comment on how to play this hand. I think there's a good chance villain has a busted flush draw on the river, but don't know if if I can call.

Full Tilt No-Limit Hold'em, $0.25 BB (9 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

CO ($3.90)
Hero (Button) ($21)
SB ($25)
BB ($20)
UTG ($12.56)
UTG+1 ($16.71)
MP1 ($27.39)
MP2 ($23.82)
MP3 ($7.50)

Preflop: Hero is Button with 6, 6
6 folds, Hero calls $0.25, SB bets $1.25, BB calls $1, Hero calls $1

Flop: ($3.75) 9, 9, 7 (3 players)
SB checks, BB checks, Hero bets $2, 1 fold, BB calls $2

Turn: ($7.75) J (2 players)
BB checks, Hero checks

River: ($7.75) 4 (2 players)
BB bets $3.50