I almost never fold in a big pot........I probably take Sklansky too much to heart.

In this spot I felt certain I was done for. Villain was fairly passive, about .8 or so aggro.

PokerStars 1/2 Hold'em (10 handed) from (Format: FlopTurnRiver)

Preflop: Hero is UTG+1 with K, K.
1 fold, Hero raises, 1 fold, MP1 3-bets, MP2 calls, 5 folds, Hero caps, MP1 calls, MP2 calls.

Flop: (13.50 SB) T, J, 7 (3 players)
Hero bets, MP1 calls, MP2 calls.

Turn: (8.25 BB) K (3 players)
Hero checks, MP1 bets, MP2 folds, Hero calls.

River: (10.25 BB) Q (2 players)
Hero checks, MP1 bets, Hero folds.

Final Pot: 11.25 BB

Results in white below:
MP1 doesn't show.
Outcome: MP1 wins 11.25 BB.

With that low aggression, it's doubtful he's bluffing here. And with 4 to a straight and 4 to a flush by the river, there's not much you're beating.

I think it's a good fold.

I think even I might fold that. The Kc is like getting poked in the eye with a stick!