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Convicted a 72-year-old man on Monterey Park shooting, California 

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11 killed in Monterey Park, California shooting

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Shooter identified as 72-year-old Huu Can Tran

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Tran used a magazine-fed, assault-style pistol

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Tran found dead with self-inflicted gunshot wound

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Most mass shooters are young

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82% of mass shooters between 1976-2018 under 45

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Median age of mass shooters is 32

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Older mass shooters are outliers but not unheard of

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Experts say access to firearms is the biggest predictor of gun violence