Given Benson's obsessive dedication to seeking justice for victims of sexual abuse, it was only a matter of time before she found a nemesis. Enter serial rapist William Lewis. The man who would come to haunt Benson is himself a victim of abuse, though he sees the experience (involving his father, his babysitter, and a trip to Dairy Queen) as a positive one. He is, as you might have already surmised, a deeply twisted individual.
As an adult, Lewis rapes, kidnaps, and kills several women, always beating whatever charges he ends up facing on technicalities. He moves around the country and changes his name repeatedly, all in an effective effort to confuse any lawyers or detectives looking into his history. After being arrested for indecent exposure in New York, Lewis taunts Benson with stories of his previous crimes, before declaring the entire story hypothetical. In this case, Lewis is able to beat the charges by questioning the testing of his DNA by the authorities. While most SVU storylines would end there, William Lewis could not let Benson go. In the season 14 finale, "Her Negotiation," he breaks into Benson's apartment with a gun.
