Sheldon Kerrick (alias Robert Sawyer) was the main antagonist of the Law & Order: Special Victims Unit episode "Name". He was portrayed by the late Richard Bright, who also portrayed Al Neri in the Godfather Trilogy.
Sheldon was a sadistic pedophile and serial killer who first killed a businessman named Robert Sawyer in 1968, took his identity, and became a plumber. In New York in the 1970s, he supposedly killed a Hispanic boy; almost 30 years after the boy's killing, his name has not been identified and was dubbed 'The Boy in the Box'.
Kerrick forced teenager Carlos Guzman to help him kidnap and kill four Hispanic boys in 1978. Kerrick threatened to kill Anna Gable, the girl Carlos loved, if he didn't help him; Kerrick was already drugging and molesting her, which would eventually drive her to abuse drugs to the point that she suffered irreversible brain damage. He then blackmailed Carlos into keeping silent, threatening to expose his part in the murders if he told anyone.
In 2005, the remains of one of the murdered boys from 1978 was found in a construction site. Through further investigation, Detective Elliot Stabler and a fingerprint technician named Millie Vizcarrondo found Anna, who told them about Robert Sawyer and Carlos. Police found more bones buried at the Sawyer house. Comparing Sawyer's fingerprints from a 1964 misdemeanor to the prints on the bodies, Stabler and Vizcarrondo found that it wasn't the same person, and found out that the real Sawyer disappeared or died around 1968, and that the new prints belonged to Sheldon Kerrick.
Kerrick, now an old man suffering from end-stage pancreatic cancer, was arrested. ADA Casey Novak offered him a deal: If he identified the Boy in the Box, he would be treated by an oncologist before his release, and would die a free man; if not, he would spend the rest of his life in prison, however long that would be. Kerrick claimed he didn't remember the boy. It is presumed that Kerrick was imprisoned and died of cancer shortly after.