In this Sept. 1, 2017, photo provided by Matthew Westmoreland, Riley Howell, right, is seen. Authorities say Howell, 21, was killed after he tackled a gunman who opened fire in a classroom at the University of North Carolina-Charlotte. Police said a few students, including Howell, died and several others were injured. Charlotte-Mecklenburg Police Chief Kerr Putney said Howell's actions likely saved the lives of other students. (Matthew Westmoreland via AP)
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