PITTSBURGH (KDKA) -- A Springdale mother has been charged in the death of her five-year-old daughter earlier this year.

Diem McMunn-Gereshenski died in June after being found unresponsive in a Springdale home. 

Toxicology reports now show that she died from methadone toxicity. 

Samantha McMunn says she's in recovery and takes a daily dose of methadone.

She also told police that it's possible the girl got into the medication when she left the room for a moment.

Police say the level of methadone in the girl's blood is consistent with an adult maintenance dose.

McMunn was charged with involuntary manslaughter and endangering the welfare of a child. She turned herself in on Friday morning.