A terrifying moment in Washington, D.C., as a gunman opens fire near a high-profile event. A growing mystery emerges as scientists connected to high-level research are turning up dead or missing—coincidence, or something more? We also break down a murder that’s rocked the University of Massachusetts campus, a chilling new look inside the mind of the Long Island Serial Killer, and a Bahamas disappearance that isn’t adding up. Tune in for all the details. 

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