The crash injured six other people, including his three children and their mother. Family members said one of those children, his infant daughter Abby, died Friday night.
Abraham Franco, 29, died at the scene of the Nov. 26 collision on the eastbound 60 Freeway. He was honored a week later at a vigil that doubled as a fundraiser for the surviving members of his family.
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Gilbert Franco wore a white T-shirt with the words "In Loving Memory" and his brother's likeness on the front.
Memorial held for father killed in Diamond Bar crash that injured 6 others
Abraham Franco was "warm, friendly, goofy, protective and loyal most of all" his sibling said. "He impacted everyone that's here," he added.
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A GoFundMe page has been established to help the Franco family.