Jeff The Killer was the given name of a 13-year-old boy who, after surviving a brutally disfiguring attack by bullies, had a mental break and slaughtered them in retribution. The bully attack had left Jeff badly burned, and in order to keep his spirits up, he carved a garish smile into his face.beaten to death by a fellow inmate lost his sanity after witnessing his "new" and "beautiful" face. Slenderman is like a boss or father figure to him. Eyeless Jack is like a brother to him! Hates ben 