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For more than forty years, Kim Parmer has been haunted by the prospect that someone murdered her cousin, Sandy Beal, in 1977. Award-winning reporter Melissa Jeltsen investigates the mysterious death of a teenage girl in Prince George's County, Maryland.

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• The story that brought Kim to Melissa

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Unbeknownst to her parents, Sandy Beal was secretly dating a married state trooper at the time of her death. The letter she left him in her car leaves her family with more questions than answers.

If you or someone you know is considering self-harm, please contact the National Suicide Prevention Lifeline at 1-800-273-8255, or text "STRENGTH" to Crisis Text Line at 741-741.

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A journal entry sheds light on Sandy’s desires to be a police officer. When she suddenly dies, the homicide detective tasked with her case is inundated with strange phone calls.

If you or someone you know is considering self-harm, please contact the National Suicide Prevention Lifeline at 1-800-273-8255, or text "STRENGTH" to Crisis Text Line at 741-741.

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The exact nature of Sandy's relationships with local police officers comes under new scrutiny.

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Sandy’s newly released police file reveals that she sought help from law enforcement months before her death.

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The Beals' distrust of police leaves even the most basic facts about Sandy's case up for interpretation.

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Sandy’s cousin Kim meets with a cold case detective who offers her something unexpected - and transformative.

If you or someone you know is considering self-harm, please contact the National Suicide Prevention Lifeline at 1-800-273-8255, or text "STRENGTH" to Crisis Text Line at 741-741

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