Deborah Roberts unpacks the decades-long hunt for Claire Gravel's killer with a former detective whose pursuit of justice contributed to a DNA breakthrough. To get ad-free episodes, early access to new true crime podcasts, and exclusive bonus episodes, subscribe to 20/20 True Crime+ on Apple Podcasts. Click here to start your free trial today. Terms apply. Learn more about your ad choices. Visit podcastchoices.com/adchoices