A brother who traveled more than 1,000 miles to confront his sister's killer. An uncle of an orphaned 4-year-old whose parents died while shielding the boy from the spray of bullets. A wife whose husband was gunned down at her side while their 9-year-old granddaughter looked on.

Nearly four years after a white gunman killed 23 people at a Walmart in El Paso, Texas, in a racist attack that targeted Hispanic shoppers, relatives of the victims are packing a courtroom near the U.S.-Mexico border this week to see Patrick Crusius punished for one of the nation's worst mass shootings.

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