learning the right way to fold slick???

[HEIFER]

Villians stats are roughly 44/9. Hes not generally aggressive but has donked many times in hands when he has improved.

Pre-flop: (5 players) Hero is BB with :kh :ad
UTG folds, CO calls, Button raises, SB calls, Hero 3-bets, CO calls, Button calls, SB calls.

Flop: :5s :2c :th (8SB, 4 players)
SB bets, Hero raises</font>, CO 3-bets, 2 folds, Hero calls.

Turn: :9d (7.5BB, 2 players)
Hero checks, CO bets, Hero calls.

River: :qs (9.5BB, 2 players)
Hero checks, CO bets, Hero ???

[Scotty.]

I fold the turn.