"Much comment has recently been made on the number of adult stars having passed in the last year and with great sadness we must inform that the list has grown longer.
"Olivia joined LA Direct Models in April 2017, though had not been available for work since early October of last year, as she had been facing some personal challenges that had seen her in residential rehab for a period of nearly three months and from which she had been out for about a month, hoping to make a return to work in the early part of this year.
"We learned today that she had returned to a different facility in West Hollywood after a relapse, approximately a week ago, at which she was found deceased this morning.
"Family and close friends [said] they had deep concern at the volume of prescription drugs prescribed to Olivia and the danger this posed [to] her. If this was mixed with recreational drugs or alcohol, it is believed this to be the cause of her passing," he said.
Olivia Nova, who died in Las Vegas earlier this month aged 20 from sepsis that is believed to have been caused by a UTI, also worked for LA Direct Models.
Hay said it was merely a "coincidence" that the two most recent deaths were of women who belonged to his agency.
"We at Direct Models obviously can barely believe we are issuing a notice such as this, not once but twice, in such a short space of time.
"The coincidence that both of these models chosen stage names is Olivia is solely that and they otherwise have no connection. We actually do not think they had ever met."
Days before her death, Lua shared cryptic social media posts including one which read "no one alive can be an angel forever".
It is not clear if any of the five models who have died recently knew one another.
So far, there has been no proof of a link between any of their deaths beyond the fact that they were all porn stars.
The first death was that of 35-year-old Shyla Stylez. Stylez died in her sleep at her mother's home in Calgary on November 9. So far, no reason has been given for her death.
Stylez left the porn industry in 2016 after 10 years.
In December, actress August Ames, 23, hanged herself in California, where she lived with her husband.
August Ames, 23, hanged herself on December 5. Photo / Instagram
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.
Ames' argument was that because the male actor worked with both men and women, he was more likely to have contracted STIs and she believed it put her at risk.
Days after Ames' death, 31-year-old Yurizan Beltran died of an apparent drug overdose at home in California. It is not known if the overdose was accidental or intentional.
On January 9, 20-year-old Olivia Nova died in her bed in Las Vegas.
The young actress had been tweeting about how she was alone for the holidays and wanted to call a fan to lift her mood.
At first, it was suspected that drugs or alcohol may have played a part in her death.
However police reports which have emerged recently suggest the woman was suffering from sepsis.
