Samantha Whitney Jones, 30, from Pennsylvania, was charged Friday with criminal homicide following the death of her 11-week-old son R.J. in April.
PEOPLE claims, an autopsy allegedly revealed the baby had died after Jones allegedly fed him breast milk tainted with methadone, amphetamine and methamphetamine.
According to the criminal complaint and the affidavit of probable cause obtained by PEOPLE, the medical examiner said, 'R.J. ingested the combination of fatal drugs through breast milk.'
The affidavit also states that on the morning of April 2, Jones called 911 after she found her son 'white and not breathing.'
Jones and her mother, who was also in the house, began administering CPR to the infant at the direction of the dispatcher, the affidavit says.
Later, Jones told police that she had been prescribed methadone because of an addiction to painkillers, the affidavit alleges.
The affidavit adds that Jones had started giving her son formula because he was not getting enough milk from breastfeeding.
On the morning the child died, Jones told authorities she tried to breastfeed him when he woke up at 3am crying because she was too tired to go downstairs and prepare a bottle of formula, the affidavit alleges.
Jones will remain in Bucks County Jail until her court appearance on July 23. She is yet to enter a plea.
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This article originally appeared on New Idea.