STTF SNG->cash thread

[TruFloridaGator]

Guy is super aggressive postflop & 30/25 over a small sample. Raising range could be wider than 25% here from what I've seen.

Poker Stars, $1/$2 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

UTG: $158.75
MP: $278.45
CO: $203.45
BTN: $307.65
Hero (SB): $215.40
BB: $200

Pre-Flop: 3[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/spade.gif[/img] dealt to Hero (SB)
UTG folds, <font color="red">MP raises to $8</font>, 2 folds, Hero calls $7, BB folds

Flop: ($18) 4[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">MP bets $12</font>, Hero calls $12

Turn: ($42) 6[img]/images/graemlins/club.gif[/img] (2 Players)
Hero checks, MP checks

River: ($42) 5[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero ?

Should I block the river here &amp; for how much? Or is my thinking way off?