An infant girl has died from a lethal dose of morphine that was in her mother's breast milk, US authorities said.
The mother, 37-year-old Stephanie Greene, was charged with homicide by child abuse.
Investigators in Columbia, South Carolina, say Greene's six-week-old daughter, Alexis, was found dead in her parents' bed in November 2010.
Autopsy results showed high levels of morphine in the child's blood. Authorities say the painkiller got into Greene's breast milk after she took pills and used patches containing morphine constantly since the baby's birth.
Investigators say she illegally obtained the drugs at least 38 times in less than two years.
Greene was awaiting a bail hearing.