So far, there has been no proof of a link between any of their deaths beyond the fact that they were all porn stars.
It is not clear if any of the five models who have died recently knew one another.
Direct Models said Lua had been battling addiction for some time and was seeking help.
The former teacher said she was 'really open-minded', adding: 'There's a really big stigma associated with it, and how our society views it' 'They were really trying to pull me away from staying in the industry.
Before 2002, her work involved non-nude modeling and she was also a Budweiser Girl.
On January 9, 20-year-old Olivia Nova died in her bed in Las Vegas.
What prompted her suicide remains unclear but in the days beforehand, she found herself in the center of a firestorm on Twitter after publicly saying that she had refused to work with a man she knew did both straight and gay scenes.