A Tennessee woman was charged with murder after her premature twins were born with drugs in their systems and later died at the hospital.

Tiffany Marie Roberts, 29, gave birth at TC Thompson Children’s Hospital in Chattanooga on Sunday, at only 23 weeks pregnant, ABC 9 reported. Both preemies — who tested positive for “several narcotics,” including cocaine — died two days later, only nine hours apart, according to the report.

Authorities were called to investigate, and took Roberts into custody later that day. She was charged with first-degree murder, aggravated child abuse and viable fetus as a victim, according to the report.

Roberts had tested positive for ecstasy on the day she delivered the babies, and admitted to using the drug, according to an arrest affidavit obtained by The Tennessean.

She had also tested positive for various drugs — including cocaine, oxycodone, roxicodone, methamphetamine, and benzodiazepine — during her pregnancy checkups on three different dates, police told the paper.

“Based on Ms. Roberts’ illicit drug use during her pregnancy, in conjunction with the medical records, the infants were subject to aggravated child abuse and neglect which later led to their deaths,” an officer wrote in the affidavit.