A parent killing a child happens more often than we think

Updated 1901 GMT (0301 HKT) July 7, 2017

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(CNN)It's the most unfathomable of crimes: a parent killing their own child. It grabs headlines when it happens -- like this week in Georgia, where a mom is accused of stabbing four of her children to death. The reality is, filicides happen with depressing regularity in the US. And mothers are almost as likely to be the killers as fathers.