TP on prd flop (short handed)

[Fadook]

.5/1 4 players
UTG is 69.91/14.6/.75. His stats pretty much tell the story.
Don't have much on BTN, seems loose and kinda passive.
BB is 21.85/11.26/2.73, can't recall him doing anything out of line.

Hero is in SB with J[img]/images/graemlins/club.gif[/img]6[img]/images/graemlins/club.gif[/img]

Preflop: UTG calls, BTN calls, Hero calls, BB raises, everyone calls.

Flop (8 SB): 4 [img]/images/graemlins/heart.gif[/img]4 [img]/images/graemlins/diamond.gif[/img]J [img]/images/graemlins/spade.gif[/img] 4 players
Hero checks, BB bets, UTG calls, BTN calls, Hero calls.

Turn (6 BB): 6 [img]/images/graemlins/spade.gif[/img] 4 players
Hero bets, BB raises, UTG folds, BTN calls, Hero calls.

I donked the turn because if BB had AK or something, I didn't want to risk the street getting checked through. Not really sure about that reasoning.

River (12 BB): 9 [img]/images/graemlins/club.gif[/img] (3 players)
Hero checks, BB checks, BTN bets, Hero?