Relatives of the three women held the vigil Saturday near where the women were found on Long Island's Ocean Parkway in December, along with a fourth set of remains.
The discovery of the slain women led authorities to seven other sets of remains and unearthed a murder mystery surrounding who might have killed them.
No suspects have been identified in their deaths.
Police say the first four women may have been slain by a serial killer targeting prostitutes.
Relatives of the women say they want the victims to be remembered as more than prostitutes.