When a black motorist was fatally shot last year by a Minnesota police officer, the killing hit home for Shetamia Taylor, then 38 and a mother of four sons in suburban Dallas. Philando Castile had been killed outside St. Paul, near where Taylor, who is also black, spent her teens and 20s and where her 15-year-old son still lived with his dad. She decided to take her children to a protest march in downtown Dallas the following night.

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