Erin Corwin, a pregnant 19-year-old Marine wife, was found dead in an abandoned mine shaft in Joshua Tree National Park after weeks of searching. “48 Hours” correspondent Natalie Morales offers unique insights into Corwin’s case, including the NCIS agents’ tireless efforts to uncover her body. Hear a complex story of infidelity and obsession that tore more than one Marine family apart and led to Corwin's tragic death.

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Erin Corwin was a girl from small town Tennessee when she moved across the country to live with her husband, Corporal John Corwin, on a desert Marine base. They were high school sweethearts, young and in love. But less than a year later, Erin disappears. NCIS investigators leap into action, and the search for the missing Marine’s wife begins.

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Just over 48 hours since Erin Corwin’s disappearance, her abandoned Toyota Corolla was found in the desert. Looking over the desert sands, NCIS and local authorities gathered that she had met up with someone there, got into their car and drove off into the desert. The question is, who was Erin Corwin with before she went missing?

Investigators will have to look closely into Erin’s social circles in the sleepy town of Twentynine Palms, California.

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After investigating her social circle, NCIS agents discovered that Erin was planning to go into the desert with her neighbor Christopher Lee. But Chris claimed to barely know her. NCIS and the local sheriff's department dug deeper, and found out that Chris and Erin had been having a secret affair for months before Erin went missing.

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NCIS and local investigators have honed in on a potential suspect for Erin Corwin’s disappearance: Chris Lee. Detectives try to piece together the details of his affair with Erin in the interrogation room, while search and rescue teams comb through the desert in search of Erin.

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Now that Erin had finally been found, it was time to arrest Chris Lee. The only problem was, he had skipped town. Once NCIS and local investigators find him, Chris was facing a grueling trial back in San Bernardino County. But at the trial, Chris's defense attorneys claim new information about Erin—that nobody saw coming.

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