Laying Down KK preflop?

I don't have a hand history for this (played on PokerRoom)

Relevent Stacks:
UTG+1: $3.75
MP2: $32.00
Hero(CO): $34.25

Hero Dealt Kd Ks

Action:
UTG+1 raises to $1
folded to MP2 who RR to $3.75
Hero re-RR to $10
UTG+1 calls all in.
MP2 raises pot all-in.

Hero:...?

MP2 had been playing pretty weak-tight, never showing this much preflop action since I'd been at the table. UTG+1 doesn't bug me at all, he'd taken a bad beat a few hands earlier and had been kinda happy to bet his remaining stack since then. I'd been playing somewhat loose with selective agression. I was prepared to call, but then I stopped for a moment on a premonition. This guy was just playing too assuredly preflop for a weak-tight player. I considered that he maybe had KK as well, but that seemed unlikely, and even then I'm not as sure he would have played THIS agressively. I ended up folding, but since UTG+1 was all-in, I got to see if I was right or wrong. Anyone have thoughts about throwing away KK preflop?