KK Heavy action against unknown PF

[avisco01]

Is this ever a fold. Like, 3rd hand so no read, but does it even matter?

Full Tilt Poker - No Limit Hold'em Cash Game - $0.25/$0.50 Blinds - 8 Players - (LegoPoker Hand History Converter)

SB: $37.95
BB: $62.65
UTG: $49.55
UTG+1: $9.50
MP1: $50.00
MP2: $84.70
Hero (CO): $48.75
BTN: $60.45

Preflop: Hero is dealt K[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img] (8 Players)
2 folds, <font color="red">MP1 raises to $1.50</font>, MP2 folds, <font color="red">Hero raises to $4.50</font>, 3 folds, <font color="red">MP1 raises to $15.00</font>, <font color="red">Hero raises all-in to $48.75</font>, MP1 calls $33.75