Villian- 28/5
Played correctly? Definite call on river bet?

PokerStars No-Limit Hold'em, $0.05 BB (6 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Button ($10.55)
SB ($6)
BB ($5.48)
Hero (UTG) ($5)
MP ($9.08)
CO ($13.51)

Preflop: Hero is UTG with K, A
Hero raises to $0.20, MP calls $0.20, 1 fold, Button calls $0.20, 1 fold, BB calls $0.15

Flop: ($0.82) J, A, 9 (4 players)
BB checks, Hero bets $0.75, MP calls $0.75, Button calls $0.75, 1 fold

Turn: ($3.07) 3 (3 players)
Hero bets $1.60, MP calls $1.60, Button calls $1.60

River: ($7.87) J (3 players)
Hero checks, MP checks, Button bets $1.80, Hero ???