Fentanyl is a synthetic opioid that is up to 50 times stronger than heroin and 100 times stronger than morphine, according to the CDC. It is often added to other drugs because of its extreme potency.

A judge will decide what sentence Samantha Yi will serve in the death of a 10-month-old girl from fentanyl poisoning in 2022.

The U.S. Department of Justice announced 32-year old Samantha Yi's guilty plea yesterday. Her boyfriend, 31-year old Darnell Mendez had already pleaded guilty in July.