The Supreme Court on Monday reinstated a murder conviction in the 1979 disappearance of 6-year-old Etan Patz.
The 2nd US Circuit Court of Appeals based its decision on a flawed jury instruction given by a New York State judge about Hernandez's purported confessions.
Etan's father Stan Patz spoke at the sentencing, telling Pedro Hernandez, "I will never forgive you. You are the monster in your own nightmares."
Attorneys for convicted killer Pedro Hernandez were in court Thursday to argue jurors in his retrial knew that jurors from his first trial were in the courtroom.
Alice Fontier said in court papers that her client Pedro Hernandez could not have gotten a fair trial because the jury was unfairly influenced by how close former jurors were to the Patz family.
The jurors called the various confessions by Hernandez, some of them recorded on video and played repeatedly during the four-month trial, "very reliable."