The above is a still of the video footage. This is just seconds before Sarah Guyard-Guillot fell to her death. She was hoisted up the side of the stage before she slipped. The acrobat was a 31-year old mother of two and performed in Ka at the MGM Grand.

Audience members said initially people believed it was part of the show "Cirque bosses said they are 'heartbroken' and 'devastated' by her death". - via Daily Mail 

New footage below shows the incident