$33's Nut flush w/ 3 of kind on board, villain all-in?

[Dr_Jeckyl_00]

I have nut flush (and slow play), but 3 of a kind on the board so a FH or 4oK seems very likely... call or fold?

Seat 3 is the button
Total number of players : 6
Seat 3: Dr_Jeckyl_00 ( $1735 )
Seat 4: golf2much ( $1565 )
Seat 1: queue41 ( $985 )
Seat 7: Red_Hair ( $1520 )
Seat 10: Chaser5 ( $830 )
Seat 9: kristone ( $1365 )
Trny:17868836 Level:3
Blinds(25/50)
** Dealing down cards **
Dealt to Dr_Jeckyl_00 [ Ad Kd ]
kristone folds.
Chaser5 folds.
queue41 calls [50].
Dr_Jeckyl_00 raises [175].
golf2much folds.
Red_Hair calls [125].
queue41 folds.
** Dealing Flop ** [ 6h, 9d, Jd ]
Red_Hair bets [50].
Dr_Jeckyl_00 calls [50].
** Dealing Turn ** [ 6d ]
Red_Hair bets [375].
Dr_Jeckyl_00 calls [375].
** Dealing River ** [ 6s ]
Red_Hair is all-In [920]
Your time bank will be activated in 5 secs. If you do not want it to be used, please act now.
Dr_Jeckyl_00 will be using his time bank for this hand.
Hero?
Results in White <font color="white">
Dr_Jeckyl_00 folds.
Red_Hair shows [ 8h, 5h ] three of a kind, sixes.
Red_Hair wins 2195 chips from the main pot with three of a kind, sixes.
</font>

[tigerite]

Push the turn..

[aujoz]

your chance to win was on the turn.... here your opponent bet on the flop, the turn, and now the river meaning that they probably have something.

You don't beat any hand they're likely to have.