50$ NL Deep Stacks... Extremely weird river

[Malachii]

50$ NL with deep stacks. No read on Villain.

I've got about 89$ and Villain has around $150.

And yes, I know this is a fold preflop.

Party Poker No-Limit Hold'em (NL$50) <font color="#0000FF">(10 handed)</font> link

Preflop: Hero is CO with J[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, MP2 calls $0.50, <font color="#666666">1 folds</font>, <font color="#CC3333">Hero raises to $2.00</font>, <font color="#666666">3 folds</font>, <font color="#CC3333">MP2 raises to $3.00</font>, Hero calls $1.50.

Flop: ($7.75) A[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
MP2 checks, Hero checks.

Turn: ($7.75) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP2 bets $0.50</font>, <font color="#CC3333">Hero raises to $7.00</font>, MP2 calls $6.50.

River: ($21.75) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP2 pushes all in, Hero...</font>