NEW ORLEANS (AP) — A grand jury refused on Tuesday to indict a doctor accused of murdering four seriously ill hospital patients with drug injections during the desperate aftermath of Hurricane Katrina, closing the books on the only mercy-killing case to emerge from the storm.

Dr. Anna Pou acknowledged administering medication to the patients but insisted she did so only to relieve pain.

Pou (pronounced "Poe") and two nurses were arrested last summer after Attorney General Charles Foti concluded they gave "lethal cocktails" to four patients at the flooded-out, sweltering Memorial Medical Center after the August 2005 storm.

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Foti said Tuesday that the grand jury had erred. He released reports from four medical experts who determined the deaths were homicides.

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