Guillot-Guyard, 31, fell to her death during a performance of the show "Ka" in Las Vegas last Saturday.
The coroner's office said on its website Tuesday the acrobat and aerialist died of multiple blunt force trauma.
The Nevada Occupational Safety and Health Administration is investigating the incident.
"I am heartbroken," Cirque du Soleil founder Guy Laliberte said in a statement to the Toronto Globe and Mail newspaper. "We are reminded with great humility and respect how extraordinary our artists are each and every night. Our focus now is to support each other as a family."
Guillot-Guyard was the first stage casualty in the company's 29-year history, Cirque spokeswoman Renee-Claude Menard told the newspaper.