Her Secret Family Killer (2019)

On Sarah's birthday, her best friend Victoria gives her a genetic testing kit as a gift so she can learn more about her family's lineage. But that night, Victoria is tragically killed. Weeks later, Sarah gets a knock on her door, and it's the police. As their homicide case ran cold, they decided to run the killer's DNA through the genetic testing site's database and there was a match: Sarah.