4NL - AKs trip kings on river

[maverick007]

Villain is 18/12 over 265 hands.

Cake Poker No-Limit Hold'em, $0.04 BB (9 handed) - Cake-Poker Converter Tool from FlopTurnRiver.com

BB ($4.84)
UTG ($3.65)
UTG+1 ($1.35)
Hero (MP1) ($4.44)
MP2 ($4.31)
MP3 ($4.06)
CO ($3.18)
Button ($3.33)
SB ($1.14)

Preflop: Hero is MP1 with A, K
2 folds, Hero bets $0.16, 3 folds, Button calls $0.16, 2 folds

Flop: ($0.38) J, 10, 9 (2 players)
Hero bets $0.24, Button calls $0.24

Turn: ($0.86) K (2 players)
Hero bets $0.43, Button calls $0.43

River: ($1.72) K (2 players)
Hero checks, Button bets $1.16, Hero folds

Total pot: $1.72 | Rake: $0.11

Was the turn bet or the River Check/Fold, a mistake?