The character "Killer Jeff" first appeared on Newgrounds in August 2008, uploaded by user Sesseur .
In the popular fan version, Jeff is disfigured during a fight with bullies who set him on fire with bleach and gasoline. The Transformation: Jeff Killer Jumpscare
As with all internet horror, the eventually collapsed under its own weight. By 2015, "Jeff the Killer" had become a source of ironic humor. The original image, once terrifying, began to look goofy when isolated from the screamer audio. The character "Killer Jeff" first appeared on Newgrounds