Whats your move on the reraise?

Party Poker No-Limit Hold'em, $ BB (10 handed) FTR converter on zerodivide.cx

Button ($24.50)
SB ($24.05)
BB ($24.25)
Hero ($28.05)
UTG+1 ($21.90)
UTG+2 ($30.50)
MP1 ($20.90)
MP2 ($8.60)
MP3 ($34.97)
CO ($23.70)

Preflop: Hero is UTG with K, K. SB posts a blind of $0.10.
Hero raises to $1, 5 folds, CO calls $1, 3 folds.

Flop: ($2.35) 4, 4, 8 (2 players)
Hero bets $2, CO raises to $4Hero raises to $10, CO folds.

Final Pot: $16.35