After a yearlong investigation, police charged a woman with second-degree murder after her child swallowed a fatal dose of fentanyl while they were living in Mooresville. Even a pencil tip amount of the synthetic opioid pain reliever drug can be fatal, according to the U.S. Drug Enforcement Administration.

A 23-year-old mother was arrested by local and federal law enforcement in Denver this week over a year after police in North Carolina said her daughter died as a result of fentanyl ingestion.

A woman was arrested in Denver, CO, in connection with the death of her child, who died from fentanyl toxicity in Mooresville last year.