An overdose of the powerful opioids fentanyl and carfentanil caused the May death of a 13-month-old Ohio girl, the Montgomery County Coroner's Office confirmed Friday.

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Mari’oona Allen died on May 3, but officials were awaiting toxicology reports to confirm the cause of her death.

Those tests confirmed she died of acute intoxication by fentanyl and carfentanil.

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According to a Dayton police investigation report, the baby’s grandmother, Trina Miller, was babysitting the child on the night of May 2. She appeared to be acting as usually when she was dropped off and had not been ill, the report said.

The next morning, according to the report, Miller woke to find the child not breathing and called the baby's mother and 911. Miller told police the child slept with her in bed. A man described as a friend was also in the home.

Three days after the death of the child, on May 6, the child's grandmother was found deceased inside a Riverside hotel. The coroner's office confirmed it is awaiting toxicology results to determine Miller's cause of death.