Craiglist serial killer? Cops ID 3 more missing prostitutes found dumped along Long Island beach

Suffolk County cops on Monday identified the skeletal remains as Melissa Barthelemy, 24, who lived in the Bronx; Amber Lynn Costello, 27, of North Babylon, L.I., and Maureen Brainard-Barnes, 25, of Norwich, Conn.

It appears the seaside sicko may be hunting a certain type of prostitute - all three were tiny women under 5 feet and about 100 pounds.

Their identification came a week after cops identified a fourth body found on Gilgo Beach as Megan Waterman, 22, a Maine sex worker missing since the summer. She was 5-feet-5 and 150 pounds.

Similarities in how the women were killed and dumped, their body types and ages, and use of craigslist to advertise has fueled the theory that a lone maniac is the culprit.

"I think it fits within the known definition of what a serial killer would be," Suffolk County District Attorney Thomas Spota said.

Authorities have not said how the women were killed, but a source said, "There are substantial similarities in terms of the causes of death."