Claudia Seye Aderotimi, 20, of Geffrye Court, Hoxton, also known as Claudiyah Carmell and Clauidyah James, suffered a heart attack following a silicone jab in a hotel room in Philadelphia.
Police said Ms Adertomi, an aspiring actress and dancer, and three companions were staying at a Hampton Inn hotel after traveling from London.
Ms Adertomi is believed to have had the procedure carried out illegally by an unlicensed medical practioner.
Investigators said that a woman was questioned but not arrested.
Lt Ray Evers has said that investigators are now pursuing a second woman who is believed to have performed the procedure.
Detectives said the procedure, believed to have been arranged over the Internet, took place at a hotel near Philadelphia International Airport.
A police source said: ‘There is a thriving trade in these sort of procedures and the injectors travel from state to state.’
Claudia believed that with the cosmetic surgery, she would be hired to appear in more music videos. She posted videos of herself dancing on YouTube with a pillow stuffed down her trousers to make her backside look bigger.
Talent scout Tee Ali, who met the university student when she filmed a video, told The Sun: “She was a dancer and choreographer. The problem was she didn’t have a butt, and she wanted a butt. She went to audition for one video shoot wearing fake booty pants and she got all the attention. But when they found out it was fake she didn’t get asked back.”
Ms Aderotimi’s cause of death is listed as undetermined, pending further studies. The silicone used was industrial grade, unlike specialist silicon used by licensed practices for cosmetic surgery.
Silicone is used as permanent filler in the body and is intended to create a rounded shape. Liquid silicone is not approved in the US for cosmetic injections and is banned in some other countries.
Besides liquid silicone, injections of substances including paraffin, petroleum jelly and hydrogel have been illegally used to enlarge women’s breasts, hips and buttocks.