KK on a low board

[castigar]

Vilain was a complete donk. He went AI on the turn against my overpairs. He had a FD both times and he hit twice. I'm quite sure this line is fine against him, but if the vilain was a TAG, would it still be fine?

Full Tilt Poker - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 6 Players - (LegoPoker HH Converter)

Hero (SB): $28.55
BB: $53.75
UTG: $30.30
MP: $39.75
CO: $60.55
BTN: $32.40

Preflop: Hero is dealt K[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/spade.gif[/img] (6 Players)
UTG folds, <font color="red">MP raises to $0.85</font>, CO calls $0.85, BTN folds, <font color="red">Hero raises to $3.00</font>, BB folds, MP calls $2.15, CO folds

Flop: ($7.10) 4[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $5.00</font>, MP calls $5.00

Turn: ($17.10) 8[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $12.00</font>, MP calls $12.00

River: ($41.10) T[img]/images/graemlins/diamond.gif[/img] (2 Players)
Hero checks, <font color="red">MP bets all-in for $19.75</font>, Hero calls all-in for $8.55
Uncalled bet of $11.20 returned to MP

Pot Size: $58.20 ($2.90 Rake)