Villain is overly tight, and im 99% sure he holds the A. He wouldnt bet the turn without it.

Party Poker No-Limit Hold'em, $ BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($72.27)
UTG+1 ($62.21)
UTG+2 ($49.50)
MP1 ($50)
MP2 ($43.15)
Hero ($84.14)
CO ($64.20)
Button ($33.77)
SB ($48.50)
BB ($20.65)

Preflop: Hero is MP3 with 7, 7. MP1 posts a blind of $0.50. SB posts a blind of $0.25.
3 folds, MP1 (poster) checks, 1 fold, Hero raises to $3, CO calls $3, 3 folds, MP1 folds.

Flop: ($7.25) A, A, 7 (2 players)
Hero bets $4, CO calls $4.

Turn: ($15.25) K (2 players)
Hero checks, CO bets $6, Hero calls $6.

River: ($27.25) 6 (2 players)
Hero bets $14, CO calls $14.

Final Pot: $55.25