How did Freddy Krueger become Freddy Krueger?

Freddy Kruger was a child killer, known as The SpringWood Slasher. He was sent to trial for the murders but got off on a technicality (Because of lack of a warrant). Rather than let him go free, the parents hunted him down to the boiler room/basement of the local elementary school where he used to take his victims. They burned him in the boiler room but kept his glove as a reminder.

In the original films, Freddy was just a child killer, not a molester/pedophile. At first, writer/director Wes Craven planned on making him a pedophile, but after awhile he changed his mind and decided against it. This idea was resurrected -- against Craven's wishes -- in the new 2010 remake. The new remakes portray Freddy as both a molester and killer, and the school has been renamed to Bedham Preschool, where he was a groundskeeper who lived in the basement.

To give you a little history on Freddy's early life... His mother was a nun (Sister Mary Helena, but later called Amanda), and worked at Our Lady Of Sorrows mental Asylum ran by the church. AFter going in to give food to the worst of the inmates, she was accidently locked in the asylum by a guard and was repeatedly rapped by 100s of crazies (Freddy is taunted as The Son Of 100 Maniacs as a young boy). Like all serial killers he was abused, neglected and enjoyed killing animals and worked his way up to killing people