Las Vegas police have concluded that the death of a spa manager found dead in a cryotherapy chamber was not a criminal act.
The police homicide division said in a statement it conducted an "extensive review" of the circumstances surrounding the death of Chelsea Ake-Salvacion, 24, whose body was found in a cold chamber at Rejuvenice in Henderson Oct. 20.
Ake-Salvacion is thought to have gone into the cold chamber on her own, NBC affiliate KSNV reported.
Temperatures in the machine can fall as low as minus 240 degrees Fahrenheit, and they are not supposed to be used for more than three minutes.
Authorities with the Occupational Safety and Health Administration told KSNV she may have been in the machine for 10 hours.
Questions have been raised about the regulation of cryotherapy since Ake-Salvacion's death.
The Nevada Department of Health and Human Services said this week that it is working to determine whether they are safe for the general public. The machines are not regulated by the Food and Drug Administration.
"A major manufacturer of cryogenic therapy equipment warns that their machines are not intended to diagnose, treat, cure, or prevent any disease," health department Chief Medical Officer Tracey Green said in a statement Tuesday.
"To protect all Nevadans, we need more research and data about the health and safety effects of this industry," she said.