600NL - I check to induce, and look what happens..

[Mossberg]

villain is 58/21/2 megafish. I have a note saying that he makes big overbet bluffs, and can do so on multiple streets even. Easy fold? Snap call? I'm totally lost. I have to be right a tonne, but otoh I feel dirty folding in this spot given the board + my read on this donk.


Blinds: $3/$6
4 players
Converter

Stack sizes:
UTG: $392.15
Button: $638.20
SB: $926.95
Hero: $702.30

Pre-flop: (4 players) Hero is BB with K[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/diamond.gif[/img]
UTG calls, Button calls, SB folds, Hero checks.

Flop: 3[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] ($21, 3 players)
<font color="#cc0000">Hero bets $15</font>, UTG calls, Button folds.

Turn: K[img]/images/graemlins/heart.gif[/img] ($51, 2 players)
<font color="#cc0000">Hero bets $42</font>, UTG calls.

River: Q[img]/images/graemlins/heart.gif[/img] ($135, 2 players)
Hero checks, <font color="#cc0000">UTG is all-in $329.15</font>, Hero ________?