Vivian Alexandra Gomez, 53, an unlicensed cosmetologist, flew to the Bay Area from Florida in April 2023 to perform the procedure at a Burlingame hotel near San Francisco International Airport.
During the procedure, Christina Ashten Gourkani, 34, became immediately ill and died of respiratory failure the next day.
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Gomez was found guilty of felony involuntary manslaughter and practicing medicine without a license.
She is due for sentencing in May.