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Sophia Farmer was undergoing a wisdom teeth extraction procedure in July when she became unresponsive, Grayslake Fire Department Chief Dan Pierre tells PEOPLE

She died three days later

After a three month investigation, the Cook County Medical Examiner's Office determined her cause and manner of death

A cause of death has been revealed for a 17-year-old Illinois girl who fell unconscious during a wisdom teeth extraction procedure and was pronounced dead at a local hospital days later.

Sophia Farmer, of Spring Grove, was undergoing the dental procedure on July 21 at Northern Lakes Oral Surgery and Dental Implant Center in Grayslake when she became unresponsive, Grayslake Fire Department Chief Dan Pierre tells PEOPLE.

A 911 caller reported a person in cardiac arrest and wh

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