Amy Bishop walked into a University of Alabama faculty meeting with a gun—and opened fire. Three professors were killed, three others injured. And it only ended when her weapon jammed.

But this wasn’t her first act of violence. Years earlier, Bishop shot and killed her own brother—yet never faced charges. She was even linked to a mail bomb case. Despite clear warning signs, she built a career as a Harvard-educated professor and mother of four. Until she snapped, again.

Did the system ignore the red flags for too long?

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