How to make sense of this incomprehensible tragedy? Detective Brian Byerson has been in touch with Ashley Hargan weekly since her mother and sister were killed. She not only testified at trial; she made some dramatic moves after she discovered the truth.

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Detectives finally arrest a suspect in the Hargan family murders. But at trial, defense attorneys argue a new theory for how the killings might have happened. And that theory might cast enough doubt to throw the entire trial into question.

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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.

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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. 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.

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On the day that Helen Hargan and her mother Pamela were found dead, Helen's boyfriend Carlos spent hours convincing 911 dispatchers to send help to the Hargan house. By the time police arrived, it was too late. But Carlos' story would blow a hole in the theory that the Hargan killings were a murder-suicide.

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Pamela Hargan lived in a wealthy Virginia suburb, surrounded by family: her daughters Megan and Helen and her granddaughter all lived with her in her million-dollar home. From the outside, the Hargan women had it all. But when Pamela and Helen were found dead in an apparent murder-suicide, detectives had to ask: what was going on inside the Hargan household?

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Pamela Hargan was a successful businesswoman and a devoted mother to three adult daughters. The Hargans were a typical suburban family until one day, Pamela was gunned down in her own home and her youngest daughter, Helen, was found dead upstairs. 48 Hours correspondent Peter Van Sant unpacks the web of evidence from the complex case of the Hargan killings, revealing treacherous motives of jealousy and a family fortune.

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