New Orleans, Louisiana (CNN) -- New Orleans police lined up "like at a firing range" and fatally shot an unarmed man in the back as he fled from them in the days after Hurricane Katrina swept ashore, a witness to the shooting told CNN.

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Fuller has criticized Luken's handling of the riots that broke out earlier this year when an unarmed black man was shot and killed by a white city police officer.

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Finally, there is the overarching and historically painful reality that an unarmed black teenager lies dead at the hand of an armed Hispanic man who ignored a dispatcher's advice not to follow and engage the "suspect, " and who may have -- and this too is forensically unclear -- uttered a racial epithet while chasing him.

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