Nearly 50 years after Carla Walker’s murder, Fort Worth detectives decide to reopen the case. In Part 2, host Elin Lantz Lesser and producer Catherine Fenollosa trace how a persistent cold case investigator begins to reexamine the original evidence, and why a single swab becomes central to the new forensic effort.

With help from Paul Holes and the scientists at Othram, the DNA evidence starts to speak for itself.

America’s Crime Lab is a true crime podcast about how science solves cold cases, missing persons, and other unsolved cases. Hosted by journalist and clinical psychologist Elin Lantz Lesser, and powered by Othram’s forensic DNA lab, the show connects the science to the story, revealing what really happens in the lab and why it matters.