Hit set on river, but now there's 3 hearts! check or bet?

[DCal Zone]

BB is Pis.Toto, a very loose and VERY SPEWY player. CO is an unknown with a half buyin, but the size of his stack is a factor in this hand.

Poker Stars - No Limit Hold'em Cash Game - $3/$6 Blinds - 5 Players - (LegoPoker HH Converter)

DCal Zone (SB): $1,560.10
BB: $593.25
UTG: $530.50
CO: $274.50
BTN: $676.10

Preflop: DCal Zone is dealt 8[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/club.gif[/img] (5 Players)
UTG folds, CO calls $6.00, BTN calls $6.00, <font color="red">DCal Zone raises to $30.00</font>, BB calls $24.00, CO calls $24.00, BTN folds

Flop: ($96) J[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/heart.gif[/img] (3 Players)
DCal Zone checks, BB checks, CO checks

Turn: ($96) 3[img]/images/graemlins/heart.gif[/img] (3 Players)
<font color="red">DCal Zone bets $72.00</font>, BB calls $72.00, CO calls $72.00

River: ($312) 8[img]/images/graemlins/heart.gif[/img] (3 Players)
<font color="red">DCal Zone ???</font>


Pot Size: $312.00