What do you do when you suspect that your own brother is to blame for the seemingly random acts of violence sending shockwaves through the country? Do you keep it to yourself in order to protect him? Or do you turn him in, potentially saving the lives of hundreds of strangers, but putting him at risk of a death sentence? David Kacyznski talks about his impossible choice, and the unlikely friendship he forged in the wake of his brother’s destruction.

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