MILTON, Massachusetts — A man on a rampage 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 doubt at the carnage wrought by 23-year-old Kerby Revelus against his sisters in the two-family home they shared with their parents and grandmother.

-FOX News

The “clear motive” is that the man was a criminal psychopath who should have still been in prison, not recently released after serving time on a gun charge. His “constitutional rights” just cost two innocents their lives and left his surviving sister with a lifetime of agony.