<p>A retired attorney in California revolutionized the field of crime fighting — all from her home. Barbara Rae-Venter identified the notorious Golden State Killer as Joseph James DeAngelo thanks to investigative genetic genealogy, a technique using DNA to build the family tree of the killer. Barbara recalls how a hobby turned into an unexpected career and how her work has been able to help other cold case victims finally find justice with the help of genetic genealogy.</p>