I'm wondering how this hand could have played differently he wound up snap shoving the river. The villian is a reg with 19/16/6.5 perhaps I should have 4b folded pre.

***** Hand History for Game 61539093441 ***** (Merge)
Tourney Hand NL Texas Hold'em - Thursday, September 27, 02:15:38 ET 2012
Table Weekly 7 The Midweek Monster  15000 Guaranteed  (61284981) (Real Money)
Seat 8 is the button
Seat 3: poonaniboy ( $416672.00 USD )
Seat 6: kekzee2356 ( $804974.00 USD )
Seat 8: TuffLuck310 ( $304954.00 USD )
poonaniboy posts ante of [$1200.00 USD].
kekzee2356 posts ante of [$1200.00 USD].
TuffLuck310 posts ante of [$1200.00 USD].
poonaniboy posts small blind [$6000.00 USD].
kekzee2356 posts big blind [$12000.00 USD].
** Dealing down cards **
Dealt to poonaniboy [  6c 6s ]
TuffLuck310 folds
poonaniboy raises [$20000.00 USD]
kekzee2356 raises [$48999.00 USD]
poonaniboy calls [$34999.00 USD]
** Dealing Flop ** [ 4h, Td, 3h ]
poonaniboy checks
kekzee2356 bets [$61222.00 USD]
poonaniboy calls [$61222.00 USD]
** Dealing Turn ** [ 8d ]
poonaniboy checks
kekzee2356 checks
** Dealing River ** [ Jd ]
poonaniboy checks
kekzee2356 bets [$668353.00 USD]