Direct Models said Lua had been battling addiction for some time and was seeking help.
So far, there has been no proof of a link between any of their deaths beyond the fact that they were all porn stars.
Days after Ames' death, 31-year-old Yurizan Beltran died of an apparent drug overdose at home in California.
At first, it was suspected that drugs or alcohol may have played a part in her death.
The actress, who used the screen name Olivia Voltaire, is believed to have died from mixing prescription drugs and.
She had prescription medication given for a urinary tract infection at the home when she died, according to the report.