When Chelsea Rustad uploaded her DNA to a public database hoping to find other branches of her family tree, she never expected that process would prompt a visit from police investigators. The police were at her Washington state home with devastating news - someone in her family may have committed a double murder. 48 HOURS and correspondent Erin Moriarty immerse viewers in the case of a killer who eluded police for 31 years, then was identified in just two hours by genetic genealogist CeCe Moore.

After a young girl is adopted from Russia, her American parents come to believe she is capable of murder and return her. Years later, "48 Hours" contributor Troy Roberts learns her surprising story.