Getting CK-R'd on the river after checking turn behind

[ludo72]

Villain is 29/7/30 after about 50 hands with the last number being his aggression frequency for those of you who use this feature from PA. We have played one biggish pot this far where Hero flopped trips in a limped pot from the blinds and made two PSB on the flop and the turn and then induced an almost pot-sized bluff from Villains flushdraw. Maybe this is unimportant but atleast he has the balls to try making moves like this. Hero's table image is TAG when the following hand takes place:

Party Poker No-Limit Hold'em (NL$200) <font color="#0000FF">(6 handed)</font> link

CO ($54.90)
Hero ($365.25)
SB ($236.80)
BB ($179.25)
UTG ($35.60)
MP ($401.25)

Preflop: Hero is Button with A[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">1 folds</font>, MP calls $2.00, <font color="#666666">1 folds</font>, <font color="#CC3333">Hero raises to $9.00</font>, SB calls $8.00, <font color="#666666">1 folds</font>, MP calls $7.00.

Flop: ($29.00) 2[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, MP checks, <font color="#CC3333">Hero bets $15.00</font>, SB calls $15.00, MP calls $15.00.

Turn: ($74.00) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, MP checks, Hero checks.

River: ($74.00) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, MP folds, <font color="#CC3333">Hero bets $35.00</font>, <font color="#CC3333">SB raises to $100.00</font>, Hero thinks "wtf?"