AA in 3 way pot, must be behind right? 200NL DEEP

[McRoNiX]

Hero is a pretty decent reg. I have him as 21/17/3 over nearly 800 hands and tbh I've never really seen him get out of line much. What do you think of turn call? Is it a shove/fold situation, and as played river 100% fold right?

Absolute Poker
No Limit Holdem Ring game
Blinds: $1/$2
5 players
Converter

Stack sizes:
UTG: $177.35
CO: $53.35
Hero: $457.75
SB: $285.54
BB: $500.95

Pre-flop: (5 players) Hero is Button with A[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/spade.gif[/img]
2 folds, <font color="#cc0000">Hero raises to $8</font>, SB calls, BB calls.

Flop: 4[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] ($24, 3 players)
SB checks, BB checks, <font color="#cc0000">Hero bets $19</font>, SB calls, BB calls.

Turn: T[img]/images/graemlins/heart.gif[/img] ($81, 3 players)
SB checks, BB checks, <font color="#cc0000">Hero bets $56</font>, SB folds, <font color="#cc0000">BB raises to $136</font>, Hero calls.

River: 2[img]/images/graemlins/diamond.gif[/img] ($353, 2 players)
<font color="#cc0000">BB is all-in $337.95</font>, Hero ???

Does he really have 88 or TT here, wouldn't he just call turn or is he playing for stacks?
Cant see him showing up with a 4 very often either.