JANESVILLE, Wis. (AP) _ Janesville police say a mother is in custody for the death of her 1-year-old child who died from a drug overdose.

The 23-year-old Beloit woman was arrested Tuesday. She's being held in the Rock County Jail.

Autopsy and toxicology tests completed last week showed the child died from an overdose of methadone. Detectives questioning the mother say she admitted giving the child part of a methadone pill before the child died Dec. 26 in Janesville.