At first, it was suspected that drugs or alcohol may have played a part in her death.
Stylez died in her sleep at her mother's home in Calgary on November 9.
Direct Models said Lua had been battling addiction for some time and was seeking help.
It is not known if the overdose was accidental or intentional.
It is not known how she got the substances into the facility where she was being treated for addiction.
Hay said it was merely a 'coincidence' that the two most recent deaths were of women who belonged to his agency.