Emergency crews later found the 50-year-old's body on a fourth-floor balcony at the city centre block where the troupe had been staying.
Yesterday, friends and fans paid tribute to Lewis, a trained chiropractor best known for his long-running Las Vegas stage show Dr Scott's Outrageous Comedy Hypnosis.
Fellow Vegas hypnotist Kellie Karl said she was stunned by his death.
"Performing on stage with Dr Scott for 9-plus years ... has always been a wonderful memory of a fantastic time in my life," she wrote on Facebook. "Dr Scott and I were so close for such a long [time]. Please pray for him and his family at this time. They will need strength."
According to his website, Lewis also used hypnosis to treat patients suffering from a range of ailments from smoking and shopping addictions to sexual dysfunction and sleep disorders.
He first used hypnosis to lose weight and credits his "hypno-diet" with helping many others to do the same.
A self-help author and regular hypnosis expert on US television shows, Lewis had spent recent weeks performing in Adelaide and Sydney.
The six remaining performers confirmed yesterday the show will go on this week in Sydney before heading as planned to Brisbane.
Although Saturday's matinee was cancelled, normal service resumed later that day.
"No one knew anything was missing until the end," audience member Nader Dabit told The Sydney Morning Herald.
The performers closed the show with a tribute to Lewis, and broke down in tears during a standing ovation.
"I was shocked that they were able to do a show seeing as they had just lost their colleague and friend," said Dabit. "That takes a lot of courage."
A report on the death is being prepared for the New South Wales coroner. Police are reportedly yet to determine whether it was caused by misadventure or self-harm.
