Opponent is 27/12 with AF 7.00 after 80 hands.
I really hadn't seen the all-in donk push from him before. All I can see that beats me here is a terribly played set, or a donk 2 pair. Is this a bad fold? I felt we were to deep to call.

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($153.40)
UTG ($48)
MP ($77)
Hero ($117.20)
Button ($17)
SB ($38.65)

Preflop: Hero is CO with J, A.
1 fold, MP calls $0.50, Hero raises to $2, 3 folds, MP calls $1.50.

Flop: ($4.75) A, 7, 2 (2 players)
MP bets $3, Hero calls $3.

Turn: ($10.75) 4 (2 players)
MP bets $4, Hero raises to $8, MP calls $4.

River: ($26.75) K (2 players)
MP checks, Hero bets $8, MP raises to $64, Hero (RELUCTANTLY) folds.