FH - bet river?

[JJack]

v: 13.12/7.13/2.22 - 3,2k hands
MP1, MP2 - quite loose (25 and 30% see flop)

0.25/0.50 Fixed-Limit Hold'em <font color="blue">(9 handed)</font>
Hand recorder used for this poker hand: Texas Grabem 1.7 by www.pokerstrategy.cc.

Preflop: Hero is BU with J[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/heart.gif[/img]
<font color="grey">2 folds</font>, MP1 calls, MP2 calls, MP3 calls, CO calls, <font color="red">Hero raises</font>, <font color="grey">2 folds</font>, MP1 calls, MP2 calls, MP3 calls, CO calls.

Flop: (11.4 SB) T[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/spade.gif[/img] <font color="blue">(5 players)</font>
<font color="red">MP1 bets</font>, MP2 calls, MP3 calls, CO calls, <font color="red">Hero raises</font>, MP1 calls, MP2 calls, MP3 calls, CO calls.

Turn: (10.7 BB) T[img]/images/graemlins/diamond.gif[/img] <font color="blue">(5 players)</font>
MP1 checks, MP2 checks, MP3 checks, <font color="grey">CO folds</font>, <font color="red">Hero bets</font>, MP1 calls, MP2 calls, <font color="red">MP3 raises</font>, <font color="red">Hero 3-bets</font>, <font color="grey">2 folds</font>, MP3 calls.

River: (18.7 BB) A[img]/images/graemlins/club.gif[/img] <font color="blue">(2 players)</font>
MP3 checks, Hero ???