Police investigating the likely serial killer who dumped four bodies (the late Melissa Barthelemy, pictured at right) on Long Island's Gilgo State Beach have reportedly turned their attention to three johns who were in contact with more than one of the victims. Cops acknowledge the three men might just have been regulars, but they still want to talk to them. They are also combing over the women's apparently "voluminous" Craigslist correspondence in hopes of finding more clues. Meanwhile other working girls on the web are apparently beefing up their precautions.