"48 Hours" goes inside the painstaking investigation through the eyes of those who have spent more than three decades trying to find the 6-year-old boy and to bring closure to his heartbroken parents ...

Stan Patz, father of Etan Patz, who went missing in 1979, and Assistant District Attorney Penelope Brady, arrive for the retrial of Pedro Hernandez, in New York, Wednesday, Oct. 19, 2016.