The shooting death of a teacher in San Bernardino, California, by her estranged husband was hardly an outlier – an estimated 50 women a month are shot to death in the US by former or current partners

In one mass shooting after another, some gun control advocates and journalists see a common thread: when domestic violence is not the immediate cause of a mass shooting, it was there as a warning sign in the history of the perpetrator.

On Monday, a husband murdered his wife, an elementary school teacher, and an eight-year-old child, opening fire on them in a classroom in San Bernardino, California, before turning the gun on himself, officials said. A nine-year-old student was also injured in the attack.



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