For more than two decades, a serial killer stalked the streets of South Los Angeles -- preying on women, leaving families shattered, and stumping investigators at every turn. This is the story of how a cold case that seemed impossible to crack was finally solved thanks to dogged prosecutors, determined detectives, and a breakthrough in DNA science that changed policing forever.

Deputy District Attorney Beth Silverman spent nearly eight years bringing Lonnie Franklin Jr. to justice. In this episode, she and cold case specialist John Lewin along with Los Angeles County District Attorney Nathan Hochman take us inside the painstaking, relentless work that most people never see. The work that happens long after the cameras go away and the headlines fade.

Because while justice isn't always swift, in LA it never stops.