PokerStarsNJ $10 NLHE

HERO SB ($7.45) QsQh
BB ($10)
VILLAIN UTG ($12.59)
MP ($4.70)
CO ($9.27)
BU ($9.85)

PRE FLOP:
VILLAIN calls $0.10
MP/CO/BU fold
HERO raises $0.40
BB calls $0.40
VILLAIN calls $0.40

FLOP [Jc Kh 4c] (Pot: $1.20)
HERO bets $1
BB folds
VILLAIN calls $1

TURN [Jc Kh 4c 7h] (Pot: $3.20)
HERO bets $2
VILLAIN calls $2

RIVER [Jc Kh 4c 7h 5h] (Pot: $7.20)
HERO checks
VILLAIN bets $6.80
HERO folds

Kicking myself after reviewing this hand. Think he shows up with 2 clubs (which I unblock) far more often than a king after limp-calling. At the minimum I should have put in a blocker on the river. Thoughts?