In the early morning hours of Sept. 29, 2021, Benjamin Elliott, then 17 years old, walked into his twin sister Meghan's bedroom. It was something he had done hundreds of times. But on this morning, he had a knife in his hand and stabbed her in the neck while she was asleep. He would later say he was sleepwalking. When he realized what he had done, he immediately called 911.

"I just killed my sister," Benjamin told the emergency operator. "Oh my God … I thought it was a dream."

Benjamin's parents Kathy and Michael Elliott faced a heartbreaking and unimaginable reality: their beloved daughter, Meghan, was dead, and her adoring twin brother — their son — was accused of intentionally murdering her. They could not imagine why, and neither could investigators. Correspondent Erin Moriarty inves

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