PokerStars No-Limit Hold'em, $0.10 BB (9 handed)
Hand History converter Courtesy of
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UTG ($2.80)
UTG+1 ($11.35)
Hero ($10.50)
MP2 ($4.70)
MP3 ($13.80)
CO ($2.85)
Button ($7.80)
SB ($10.40)
BB ($9.45)
Preflop: Hero is MP1 with

,

.
UTG calls $0.10,
1 fold,
Hero raises to $0.5,
1 fold,
MP3 raises to $1, CO calls $1,
3 folds, UTG folds, Hero calls $0.50.
Flop: ($3.25)

,

,
(3 players)
Hero checks,
MP3 bets $2, CO calls $1.85 (All-In), Hero folds.
Turn: ($7.10)
(2 players, 1 all-in)
River: ($7.10)
(2 players, 1 all-in)
Final Pot: $7.10
Results in white below:
MP3 has Ks As (one pair, fours).
CO has Kd Ah (one pair, fours).
Outcome: MP3 wins $3.62. CO wins $3.47.
With this hand I figured I was behind to either a set or an overpair, especially given MP3's raise pre-flop and then flop bet. To be perfectly honest I figured seeing as how the CO was all-in I could just fold and see what they had to gain a better read in the future.
Was folding the right thing to do or should I have called, raised or even pushed?