EPISODE 7: The hunt for Antonio's killer leads us to a mysterious security group called the Sentinels. For the first time, former members speak about their operation at CHOP and describe the person they say shot Antonio at close range.

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Produced by Adelina Lancianese, with Dan Girma and Abby Wendle. Edited by Luis Trelles and Laura Greanias with Katie Simon. Fact checking and research by Dania Suleman and Miyoko Wolf. Mastering by Robert Rodriguez.