OAK BEACH - Grieving family members gathered on Oak Beach today and held a vigil on the spot where the remains of four women were found. The mothers of Megan Waterman and Melissa Barthelemy, and the sister of Maureen Brainard Barnes took part in today's event, releasing balloons into the air in memory of their loved ones. Waterman, Barthelemy and Barnes were among the 10 bodies discovered in the Gilgo Beach area since last December. Police believe a serial killer may be responsible for their deaths."We're going to find who did this," says Mari Gilbert, the mother of Shannan Gilbert, whose disappearance led to the discovery of the remains. Gilbert's body has not been found. Waterman's mother, Lorainne Ela, criticized the media for reporting that her daughter and the other victims were prostitutes on Craigslist.>Police: Bone found at Gilgo Beach doesn't appear to be humanPolice eye serial killer in Gilgo Beach slayings