On June 2, 2007, the body of 36-year-old Hugues de la Plaza was found in his locked San Francisco apartment. He had been stabbed in the neck, chest and stomach. His apartment was covered in blood, and the scene seemed to have all the characteristics of a homicide, but there was no sign of a struggle, no sign of anyone else’s DNA at the scene, and no image of an assailant on nearby security cameras. “48 Hours" correspondent Maureen Maher reports. This classic "48 Hours" episode last aired on 6/19/2010. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Investigators think they know who killed the Hargan women, but can't seem to get a confession. Then, a representative from Capital One bank sent them recordings of some strange phone calls made the day before the shootings. Someone pretending to be Pamela Hargan called the bank wanting a wire transfer for hundreds of thousands of dollars. Those recordings would expose a motive. Armed with phone records and documents, detectives are ready to indict their suspect.

Get early, ad-free access to episodes of Blood is Thicker: The Hargan Family Killings by subscribing to 48 Hours Plus on Apple Podcasts or Wondery+ on the Wondery app. The series is widely available everywhere else you get your podcasts.

Subscribe to 48 Hours+: https://apple.co/4aEgENo

Subscribe to Wondery+: https://wondery.com/plus/

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

A photographer who was on "The Dating Game" became one of the nation's deadliest serial killers -- eight years after "48 Hours"' first report, new victims emerge. Peter Van Sant reports.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

When Becky Bliefnick was murdered, an answer her husband gave on "Family Feud" years earlier raised eyebrows. Erin Moriarty reports.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Teenager Natalee Holloway disappeared on May 30, 2005 during a post-graduation trip in Aruba. Gerold Dompig, deputy chief of police in Aruba, said they did everything in their power to crack the case. But Natalee's mom, Beth Holloway Twitty, disagreed, and accused Aruban authorities of being slow in their investigation. “48 Hours" correspondent Troy Roberts reports. This classic "48 Hours" episode last aired on 3/25/2006. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

When detectives started investigating the deaths of Helen and Pamela Hargan, they came to a much different conclusion than the first responders on the scene. With newfound evidence surrounding the rifle at the scene, Helen and Pamela's cell phones, and Carlos Gutierrez's call to 911, detectives realized this was not a murder-suicide; it was a double homicide. But who could have killed the mother and daughter? Police began to zoom in on a single, shocking suspect.

Get early, ad-free access to episodes of Blood is Thicker: The Hargan Family Killings by subscribing to 48 Hours Plus on Apple Podcasts or Wondery+ on the Wondery app. The series is widely available everywhere else you get your podcasts.

Subscribe to 48 Hours+: https://apple.co/4aEgENo

Subscribe to Wondery+: https://wondery.com/plus/

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Host Anne-Marie Green sits down with the 48 Hours correspondents and producers as they look back on the latest season of 48 Hours. Hear about the team’s most memorable moments, their most challenging stories, and their biggest takeaways.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

Millionaire Forrest Fenn hid a gold-filled chest somewhere in the Rockies and wrote a poem with cryptic clues. Tens of thousands searched for it and five people died trying. A story of obsession. Tony Dokoupil reports.

See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.