AA vs. donk, ridiculous river card

[Fulzgold]

$0.1/$0.2 No Limit Holdem
6 players
Converted at weaktight.com
Villian running at 55/10/.47 over 49 hands. insta fold? Note the overbet by donk on river. anyone call here?
Stacks:
UTG (<font color="#0000cc">$20.38</font>)
UTG+1 (<font color="#0000cc">$8.24</font>)
Hero (<font color="#0000cc">$22.29</font>)
BTN (<font color="#0000cc">$21.62</font>)
SB (<font color="#0000cc">$18.05</font>)
BB (<font color="#0000cc">$20.36</font>)

Pre-flop: ($0.3, 6 players) Hero is CO A[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img]
<font color="#777777">2 folds</font>, <font color="#cc0000">Hero raises to $0.8</font>, BTN calls $0.8, SB calls $0.7, <font color="#777777">1 fold</font>

Flop: 2[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/spade.gif[/img] ($2.6, 3 players)
SB checks, <font color="#cc0000">Hero bets $1.6</font>, BTN calls $1.6, <font color="#777777">SB folds</font>

Turn: 6[img]/images/graemlins/club.gif[/img] ($5.8, 2 players)
<font color="#cc0000">Hero bets $4</font>, BTN calls $4

River: 9[img]/images/graemlins/club.gif[/img] ($13.8, 2 players)
Hero checks, <font color="#cc0000">BTN goes all-in $15.22</font>,