Villain 18/13 over a couple hands. Not enough hands to use the 3bet pot stats, but my general feeling was that villain was tight and his calling ranges on the stronger side.

He bet the river fast.

PokerStars No-Limit Hold'em, $0.50 BB (5 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

MP ($51.10)
Button ($25)
SB ($62.80)
Hero (BB) ($52.70)
UTG ($59.25)

Preflop: Hero is BB with K, J
1 fold, MP bets $1.50, 1 fold, SB calls $1.25, Hero raises to $6.50, MP calls $5, 1 fold

Flop: ($14.50) 6, 2, 2 (2 players)
Hero checks, MP checks

Turn: ($14.50) 4 (2 players)
Hero checks, MP checks

River: ($14.50) K (2 players)
Hero checks, MP bets $9, Hero ?