the killer admits that he did, the main goal of the trial is to figure out whether he belongs in a mental hospital or prison. we are learning more tonight about the clues that led investigators to tear up a new york city basement in search of a long lost little boy. those clues have to do with the carpenter and some concrete. back in 1979, etan patz became one of the first missing children to appear on the side of a milk carton in a nationwide campaign. investigators today digging through the basement, just a few doors down from where etan's family lived. he was just 6 years old when he vanished on his way to his school bus stop. the case attracted so much attention new york police say they hadn't seen anything like it since the lindberg kidnapping 40 years earlier. rick legislative that you will at the search site tonight. why the focus on that building behind you? >> well, harris, as you said, the building behind us where the search has finished for the night sits right between where etan's parents live and the bus stop the boy never made it to.