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When a young schoolteacher in Pennsylvania is murdered, her friends wonder if the killer will be caught. Following years without an arrest, investigators discover a new tool that may finally help unlock the murderer’s identity. Can police work fast enough to catch the suspect? Or will the killer slip away again? Andrea Canning reports.

Andrea Canning talks to Keith Morrison about his episode, “The Secret in Black Rock Canyon.” In 2006, 16-year-old Cassie Jo Stoddart was found stabbed to death at a relative’s home in Pocatello, Idaho. Detectives quickly learned that Cassie’s last day alive was nothing short of a real-life horror movie, with video to prove it, and the filmmakers-turned-killers were not at all who they expected. Keith and Andrea discuss his interview with one of Cassie’s killers and Keith shares an extra clip from his interview with Dr. James Garabino, a psychologist and expert on teen violence. Plus, Keith and Andrea are joined by the detective who investigated Cassie’s murder, retired Captain John Ganske.

Listen to the full episode of "The Secret in Black Rock Canyon" here: https://link.chtbl.com/dateline_podcast

When police retrace the final hours of 16-year-old Cassie Jo Stoddart, they uncover evidence including a homemade horror film that points to her killers. Keith Morrison reports.

Listen to Keith Morrison and Andrea Canning as they go behind the scenes of the making of this episode in ‘Talking Dateline’: https://link.chtbl.com/tdl_thesecretinblackrockcanyon

Keith Morrison talks to Josh Mankiewicz about Josh’s latest episode, “The Breakup.” In 2010, a California nurse was found dead in her home. Police thought they had a clear suspect, but soon discovered evidence that pointed them in a direction no one saw coming, one that kept our viewers and our correspondents guessing until the end. Keith plays Josh an extra clip from his interview with the detectives as they describe coming face to face with their initial suspect, and Josh answers viewer and listeners questions with Dateline assistant producer Jess Koernig.

Listen to the full episode of "The Breakup" here: https://link.chtbl.com/dl_thebreakup

When a nurse is gunned down in her home, detectives initially believe they have a clear suspect, but new information leads them down a completely different path. Josh Mankiewicz reports.

Listen to Keith Morrison and Josh Mankiewicz as they go behind the scenes of the making of this episode in ‘Talking Dateline’: https://link.chtbl.com/tdl_thebreakup

Josh Mankiewicz and Andrea Canning sit down to talk about Andrea’s newest episode, “Dark Intentions.” In 1996, the murder and sexual assault of two women in the same apartment complex rattled the city of Arlington, Texas and stumped police. But when two other women from the area survive sexual assaults, police find evidence that connects all four crimes. Andrea tells Josh what she learned from the women who survived their brutal attacks, and she describes the involved investigation that finally cracked the case. Andrea also plays a podcast-exclusive clip and Dateline producer Haylee Barber joins in to answer viewer questions from social media.

If you or someone you know has experienced sexual assault, call the National Sexual Assault Hotline at 800-656-4673 or visit online.rainn.org

Listen to the full episode of “Dark Intentions” here: https://link.chtbl.com/dl_darkintentions