Villain here is an 18/16/4 TAG that has been pretty spewy in the past. One hand I remember he cold called a 3bet pre with 63s OOP, though that doesn't really apply here. Point is that I think he's 100% capable of calling down with a bare Ah and donkshoving this river as a bluff since he seems to be a level 1 thinker. EZ fold??

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero ($136.90)
SB ($44.20)
BB ($33.65)
UTG ($60.35)
MP ($125.25)
CO ($93)

Preflop: Hero is Button with 5, 5.
2 folds, CO raises to $3, Hero calls $3, 2 folds.

Flop: ($7.50) 2, J, 6 (2 players)
CO bets $5, Hero raises to $15, CO calls $10.

Turn: ($37.50) 2 (2 players)
CO checks, Hero bets $23, CO calls $23.

River: ($83.50) 9 (2 players)
CO bets $52 (All-In)