Live 6/12, river play questioned

[88please]

First post, be gentle [img]/images/graemlins/smile.gif[/img]

Table is 9 handed and playing LP preflop, fairly passive postflop. To the two players that are capable of noticing it, Hero's image is tight aggressive preflop, and fairly aggressive postflop.

SB is playing LP because he's in the middle of a huge downswing, but had been playing a fairly solid LAG game earlier in the session.

BB will not raise from the blinds without aces (he's shown down kings twice from the SB) and has been playing very aggressively on the flop with strong hands and draws but shuts down often on the turn. He rarely bets a river without a very strong hand. We've played together before, and he has announced to the table (while folding a SB to my UTG raise) that he's not giving me any money today.

Here's how it went down:

UTG limps, hero limps A [img]/images/graemlins/spade.gif[/img]9 [img]/images/graemlins/spade.gif[/img] UTG+3, LP calls, BTN calls, SB completes, BB checks.

Flop comes A [img]/images/graemlins/diamond.gif[/img]A [img]/images/graemlins/heart.gif[/img]4 [img]/images/graemlins/club.gif[/img]
SB checks, BB checks, UTG checks, Hero checks, LP checks, BTN bets, SB calls, BB checkraises, UTG folds, Hero 3 bets, LP folds, BTN folds, SB cold calls 2 while glaring at me, BB calls.

Turn comes 9 [img]/images/graemlins/diamond.gif[/img]
SB checks, BB checks, Hero bets, SB calls, BB calls.

River comes J [img]/images/graemlins/diamond.gif[/img]
SB checks, BB checks, Hero bets, SB calls, BB checkraises, Hero 3 bets, SB tanks, mumbles to himself and finally folds, BB 4 bets, and I....?