Seth Piper is a sadistic teenage gang leader who raped young girls with his group.
History[]
Piper is first seen with a group of his friends on a swing set. When Rosie Meadows and Sydney Lynch are seen by the group, they harass the girls. After they ignore Piper and his friends, they all assault the girls, with Rosie being raped and murdered and Sydney being kidnapped.
A cell phone tower activates from Sydney's phone and Sergeant Benson and A.D.A Carisi find her phone on a boat. Seth is called by his mother while having Sydney as a hostage. Benson says to Piper that he started off hurting animals and now humans and he now has the opportunity to be a man or an animal.
After Seth surrenders himself and Sydney, Benson and Detective Velasco bring Piper to the crime scene to tell him that Rosie died. Benson decides to bring him to the car and jail him for murder, rape, and kidnapping. After his imprisonment, he is linked to six other rapes, with the victims willing to testify. (SVU: "Children of Wolves")