The 31-year-old fell from her harness onto the stage below. She was declared dead at Las Vegas University Medical Center, reported Ace Showbiz.
Cirque du Soleil is an acrobatic theatre group which combines dance, acrobatics, visual effects and drama. It is renowned worldwide and is known for its daring performances.
Sarah, a mother-of-two, had fallen around 50 feet on to the stage below while performing "Ka" in Las Vegas.
A visitor to the show saw the tragic accident and said, initially, the audience "thought it was part of the show".
More From This Section
He also said the reaction of the performers was almost immediate and that there was "screaming", "groaning" and "crying" from the stage. The show stopped almost immediately and within minutes an announcement was made saying the performance was over and refunds would be issued.
Guy LaLiberte, founder of Cirque du Soleil, issued a statement saying, "I am heartbroken. I wish to extend my sincerest sympathies to the family. We are all completely devastated with this news."
Sarah was a veteran performer. She was one of the original performers of "Ka" and had performed in the show since 2006.