By Richard Allen Greene, CNN

(CNN) - Zainab Shafia's crime was to run off to marry a man her parents hated. Middle sister Sahar's crime was to wear revealing clothes and have secret boyfriends. Youngest sister Geeti's crime was to do badly in school and call social workers for help dealing with a family home in turmoil.

The punishment for all three teenage Canadian sisters was the same: death.

Their executioner: their brother, acting on instructions from the father to run their car off the road.

Another family member, their father's first wife in a polygamous marriage, was also killed.

Hamed Shafia, his father, Mohammed, and his mother, Tooba Mohammed Yahya, were sentenced to life in prison for murder, with Judge Robert Maranger excoriating their "twisted notion of honor, a notion of honor that is founded upon the domination and control of women, a sick notion of honor that has absolutely no place in any civilized society."

Leading Muslim thinkers wholeheartedly endorsed the Canadian judge's verdict, insisting that "honor murders" had no place and no support in Islam.

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