A South Florida woman posing as a doctor was arrested Thursday and charged in the death of a woman who died after authorities said her body was pumped with unknown toxic substances during a buttocks-enhancement surgery.

Shatarka Nuby, a 31-year-old mother, paid a woman known as "Dutchess" hundreds of dollars to come to her house and inject her buttocks, hips, thigh,s and breasts with an unknown substance. The Dutchess, whose real name is Oneal Morris, sometimes wore medical scrubs and a stethoscope. She allegedly sealed Nuby's injections with super glue and cotton balls, according to Broward County Sheriff's deputies.

Nuby told friends the injections became hard and hot and that her skin turned black. She wrote a letter to Department of Health investigators before her death in March. An assistant medical examiner said she suffered "massive systemic silicone migration" from the injections, according to a release from the sheriff's office.