Bad play, bad beat or "it happens?"

[tripp0807]

PP NL $100, full table

Hero is BB with K [img]/images/graemlins/spade.gif[/img]K [img]/images/graemlins/club.gif[/img]

Villian is UTG+1 (first hand, posts BB) who checks, folds around to CO who calls, SB completes, Hero raises to 6, Villian calls, CO calls, SB folds. (Pot $19)

Flop: 2,4,5 rainbow

Hero bets $19
CO folds
Villian pushes all-in (raises to $45)

Hero?