CBS News Correspondent Natalie Morales and 48 Hours Producer Betsy Shuller go behind their report on the murder of Alex Pennig. When Alex was discovered dead in her bathroom her friend, Matthew Ecker, called 9-1-1 and claimed she shot herself, but detectives uncovered a different story. The team discusses the bodycam footage of first responders interviewing Ecker just minutes after Alex's death, the conflicting evidence surrounding who fired the gun, and the unusual friendship between Alex and Ecker.

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A nurse is found dead in her apartment. Surveillance video captures her coming home for the last time. Can investigators piece together what happened next? Natalie Morales reports.

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An updated report on the murder trial of Frederick Mueller, who was charged with the 2008 murder of his wife, Dr. Leslie Mueller. She was killed while the two were out for a walk near their vacation home in Lake City, Colorado. According to what Frederick Mueller told police, while the Muellers were hiking, Mueller stopped to take a photo of his wife near the edge of a cliff. He said his wife lost her footing near the waterfall and plunged into a creek. Her body was swept away downstream. It appeared to be an accident, but investigators were skeptical and believed it was murder. This classic "48 Hours" episode last aired on 9/6/2014. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.

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Join 48 Hours Correspondent Peter Van Sant and Producers Lauren White and Richie Fetzer who share their experiences visiting Room 15 where Aileen Seiden was brutally murdered by her two partners, Zach Abell and Christina Araujo. They discuss a never-before-heard interview that reveals Abell’s mother was going to testify on his behalf but she never made it to the courtroom. They also dig into the forensic evidence found at the scene and the nature of the “throuple” relationship between Aileen and her killers.

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