Trip kings facing huge river bet on drawy board

[TheJokerIsWild]

Villian is 20/2/.35 after 75 hands. Easy fold right? The only real draw on flop got there (JT), and I guess it's possible he got a backdoor flush. This guy was a total passive station for the hands that I'd seen. If his stats were different I think I'd call.

Poker Stars, $0.50/$1 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

MP: $137.75
CO: $134.40
Hero (BTN): $103
SB: $159.05
BB: $50.50
UTG: $235.90

Pre-Flop: A[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img] dealt to Hero (BTN)
UTG folds, MP calls $1, CO folds, <font color="red">Hero raises to $5</font>, 2 folds, MP calls $4

Flop: ($11.50) 8[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/heart.gif[/img] (2 Players)
MP checks, <font color="red">Hero bets $8</font>, MP calls $8

Turn: ($27.50) K[img]/images/graemlins/club.gif[/img] (2 Players)
MP checks, <font color="red">Hero bets $20</font>, MP calls $20

River: ($67.50) Q[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">MP bets $49</font>, Hero ???