TPTK OOP vs aggression

It's been a while since I posted a hand here. Please bust my balls on this one. Villain is unknown. Looking back, I think we fold the turn to his raise?

PokerRoom No-Limit Hold'em, $0.50 BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

saw flop|saw showdown

MP3 ($36.10)
CO ($57.30)
Button ($22.50)
SB ($52.65)
BB ($52.00)
Hero ($101.65)
UTG+1 ($46.55)
UTG+2 ($53.45)
MP1 ($39.00)
MP2 ($45.60)

Preflop: Hero is UTG with A, K.
Hero raises to $2, UTG+1 calls $2, 8 folds.

Flop: ($4.75) 7, K, 6 (2 players)
Hero bets $3.55, UTG+1 calls $3.55.

Turn: ($11.85) 6 (2 players)
Hero bets $6, UTG+1 raises to $15, Hero calls $9.

River: ($41.85) J (2 players)
Hero checks, UTG+1 bets $26 (All-In), Hero folds.

Final Pot: $67.85

If u got no reads,then yes i would fold to his reraise on the turn.