Cracking the code: Building the family tree of a serial killer

Retiree Barbara Rae-Venter never anticipated that her hobby of researching her family tree would lead to the capture of one of the most notorious criminals in California, the Golden State Killer. A pioneer in the use of genetic genealogy, Rae-Venter has since become an important partner for investigators seeking to solve cold cases. "48 Hours" correspondent Erin Moriarty reports.