MILTON, Mass. — A man fatally stabbed his 17-year-old sister, decapitated his 5-year-old sister in front of a police officer and then turned toward his 9-year-old sister with a knife in his hand before officers shot him dead in what their chief described as "a killing field."
There was no clear motive for the events that unfolded Saturday, the day after the 5-year-old's birthday, in a tony Boston suburb that also is home to Gov. Deval Patrick. But there was no...
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