AQo terrible call down

KillerDucky PokerStars 2/4 Hold'em (10 handed) FTR converter on zerodivide.cx

Preflop: Hero is Button with As, Qc.
1 fold, UTG+1 calls, 1 fold, MP1 calls, 2 folds, CO calls, Hero raises, 2 folds, UTG+1 calls, MP1 calls, CO calls.

Flop: (9.50 SB) 8c, 3c, Jc (4 players)
UTG+1 checks, MP1 bets, CO calls, Hero calls, UTG+1 calls.

Turn: (6.75 BB) Ah (4 players)
UTG+1 checks, MP1 bets, CO calls, Hero calls, UTG+1 folds.

River: (9.75 BB) 2s (3 players)
MP1 bets, CO calls, Hero calls.

Final Pot: 12.75 BB