Etan Patz Update

Etan Patz Update
Photo shows an original Etan Patz missing person poster.

The alleged killing is more than three decades old, the body's never been found and the motive is murky. Finally, the only clear piece of evidence -- a recent confession in the murder of six-year-old Etan Patz--came from a New Jersey man who, according to his lawyer, is delusional. ABC's Aaron Katersky has more.