Freddy Krueger used to be the son of a nun who was raped by 100 lunatics at the asylum she worked for. When he grew up, he became a child murderer; he'd kidnap the children from Elm Street and, well, kill them....his favorite method was taking out their eyes with his glove of knives. The parents of the murdered children soon discovered that Freddy was the one committing the heinous crimes, so they went together to his house and burnt the house down. I'm not sure how Freddy became the nightmare he is (lol!), I think it was the evil inside him that allowed him to live on in another form of life >:)
Freddy, as the first answerer said-son of 100 maniacs *starts singing*
Not only was he a child murderer but after he killed his wife, his own little girl was taken from him. (He has a few more reasons to kill)
So he was burned alive because of being a child murderer.
If you want to know how he 'became a monster'
3 weird devilish things met him and right before he was complete ash they entered his body and gave him power. Now he can enter dreams as he pleases.
:) Hope I helped
Going off from the original; Fred Krueger was the bastard son of 100 maniacs, being that is NUN mother was raped by 100 lunatics. He married, had a daughter, killed his wife his kid was taken away from him. He went crazy, made a bladed glove, wore a red and green striped sweater, a fedora, molested and killed the boys and girls of his home town, sometimes in that order, sometimes not. The parents, for some odd reason, hunted him down to his boiler room where he took his kids, and fried his ass crispier than the Colonel's takeout. LOL! Going off of the remake; Fred Krueger was the gardener t the old preschool, and sexually and physically harmed the children in his "Magic Cave". The parents got pissed, chased him down to a boiler room and fried his ass even MORE crispier then the Colonel's takeout. LOL, again!!!!
Freddie started to kidnap children and murder them. Soon the parents of Elm St. Found out about this and they all banded together to kill Freddie in the boiler room in his house. All that was left was his gloves.
He abused some kids and then when their parents fond out they burned him. Then, freddy has the power to kill children in their sleep. Here's the song "One two Freddy's coming for you, three four lock your doors, five six grab your crucifix, seven eight gonna stay up late, nine ten never sleep again