YAPHANK - Suffolk County District Attorney Thomas Spota says the deaths of four women found on Gilgo Beach may be the work of a serial killer.

"I think it fits within the known definition of what a serial killer would be," Spota says.

Police yesterday identified the remains of three more women found near Gilgo Beach in December. Authorities say the three women were missing prostitutes in their 20s who advertised on the Internet, including one woman from North Babylon.

Police say one of the four bodies was identified as Long Island-native Amber Lynn Costello, 27, who was last seen on Sept. 2. Police identified the other two bodies as Maureen Brainard-Barnes, 25, of Norwich, Conn., and Melissa Barthelemy, 24, of the Bronx.

Officials say Brainard-Barnes went missing in July 2007. Barthelemy was last seen in July 2009.

Authorities identified one of the victims last week as Megan Waterman, 22, a missing Maine prostitute last seen in June.

Police say the four women are believed to have been killed as a direct result of meeting clients and say the manner of their deaths is similar.

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