Extremely passive guy donks river - shove or call? Fold?

[deaders]

Villain is 40/0/0/5, his favourite button is the one that says "CALL"

Full Tilt Poker, $1/$2 NL Hold'em Cash Game, 3 Players
LeggoPoker.com - Hand History Converter

BB: $193
Hero (BTN): $234.60
SB: $196.35

Pre-Flop: 5[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/heart.gif[/img] dealt to Hero (BTN)
<font color="red">Hero raises to $7</font>, SB calls $6, BB folds

Flop: ($16) 4[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/club.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $10</font>, SB calls $10

Turn: ($36) A[img]/images/graemlins/spade.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $27</font>, SB calls $27

River: ($90) 2[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">SB bets $46</font>

Ive seen him peel the flop oop with AT high and stuff like that.