In December, actress August Ames, 23, hanged herself in California, where she lived with her husband.
She was an assistant for the health care of the elderly in the hospital in Queens before her porn career.
It is not clear if any of the five models who have died recently knew one another.
It is not known if the overdose was accidental or intentional.
The first death was that of 35-year-old Shyla Stylez.
The young actress had been tweeting about how she was alone for the holidays and wanted to call a fan to lift her mood.