Now they just have to find her.
Her name is Padge Windslowe, also known by her professional name "Black Madam."
Windslowe lives with her boyfriend in Ardmore, Pa. Police searched the place on Thursday and, sources say, they found some of what they were looking for, including silicone - the substance that may have been used in the injection.
However, they didn't find Windslowe.
A man who answered a knock told Action News "Get away from the door."
Windslowe is a transgendered man who also used the name "Lillian Lang."
According to a court document obtained by Action News, the victim and her friends went to the Hampton Inn to meet with Windslowe for buttocks enhancement injections.
Unknown to them, they were already under surveillance by a federal agent for suspected illegal drug activity. Hotel personnel alerted the undercover agent when aspiring model Claudia Aderotimi, 20, became sick.
She died a short time later at the hospital.
Her death was apparently caused by an injection of an illegal liquid.
Police interviewed one of her friends who also had the injections. 20-year-old Theresa Gyamfi told them she and Aderotomi had also been here last November for injections from Windslowe.
They made contact with Windslowe through Schefee Wilson. Undercover agents saw Wilson leaving the Hampton Inn and traced her to a $3 million mansion in Saddle River, New Jersey.
Police say Wilson was not involved in administering the injections and is cooperating with their investigation.
Windslowe could eventually be charged with murder depending on autopsy results which may still be weeks away. In the meantime, the victim's friends have been shown a photo of Windslowe and have positively identified her. They are scheduled to return to London on Saturday.