AA Donk bet on the river, Call or fold?

[KCrow]

No stats or reads on the villain. Comments on all streets welcome.

Full Tilt Poker - No Limit Hold'em Cash Game - $0.25/$0.50 Blinds - 6 Players - (LegoPoker (http://www.legopoker.com) Hand History Converter (http://www.legopoker.com/hh))

SB: $148.05
BB: $68.10
UTG: $53.90
Hero (MP): $83.90
CO: $50.25
BTN: $49.75

Preflop: Hero is dealt A/images/graemlins/spade.gif A/images/graemlins/diamond.gif (6 Players)
UTG folds, <font color="red">Hero raises to $2.00</font>, CO folds, BTN calls $2.00, SB calls $1.75, BB folds

Flop: ($6.50) 3/images/graemlins/diamond.gif 4/images/graemlins/heart.gif Q/images/graemlins/heart.gif (3 Players)
SB checks, <font color="red">Hero bets $5.00</font>, BTN folds, SB calls $5.00

Turn: ($16.50) K/images/graemlins/spade.gif (2 Players)
SB checks, <font color="red">Hero bets $10.00</font>, SB calls $10.00

River: ($36.50) 8/images/graemlins/heart.gif (2 Players)
<font color="red">SB bets $20.50</font>, [i]Hero?

[DaycareInferno]

i would fold. the turn and the river were both scary cards. you've shown strength the whole hand, but the guy is still firing into you on the river. it sucks, but i dont see anythig you beat playing this way.

[mookboi]

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i would fold.

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[Spanky1974]

Flop and turn look good. I doubt he has stuck around this long to make a decent bet with a hand that you beat on the river. Fold.