Flop Second Nuts, Fold River?

[SnakeRat]

BB is playing tight and I haven't seen him get out of line.

Party Poker 2/4 Hold'em (9 handed)

Preflop: Hero is MP3 with 8[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/club.gif[/img].
UTG folds, UTG+1 folds, MP1 folds, MP2 folds, <font color="CC3333">Hero raises</font>, CO calls, Button folds, SB folds, BB calls.

Flop: (6.50 SB) 8[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="blue">(3 players)</font>
BB checks, <font color="CC3333">Hero bets</font>, CO folds, BB calls.

Turn: (4.25 BB) 3[img]/images/graemlins/spade.gif[/img] <font color="blue">(2 players)</font>
BB checks, <font color="CC3333">Hero bets</font>, <font color="CC3333">BB raises</font>, <font color="CC3333">Hero 3-bets</font>, <font color="CC3333">BB caps</font>, Hero calls.

River: (12.25 BB) 3[img]/images/graemlins/club.gif[/img] <font color="blue">(2 players)</font>
<font color="CC3333">BB bets</font>, Hero calls.

Final Pot: 14.25 BB

Do I have to make the crying call here? I honestly believe it is -EV.

[sublime]

Do I have to make the crying call here? I honestly believe it is -EV.

You MUST call.

[SnakeRat]

What hands do you think a tight decent player could have here?
Is he capping me on the turn as a bluff?

[Tosh]

You look screwed to me. I would probably call for my sanity but I think you can lay it down against someone you know to be normal.

[sublime]

What hands do you think a tight decent player could have here?

Like Tosh said, you are in trouble here and will most likely lose. But its one more bet in a large pot, just call it.