New York ( CNN ) -- The remains of three women found on a remote stretch of beach in Long Island , New York , do not include those of Shannan Gilbert , whose search led to the investigation of a possible serial killer . Gilbert , 24 , of Jersey City , New Jersey , has been missing since May and was last seen alive in the Gilgo Beach area . As authorities searched for clues concerning her disappearance last year , they uncovered a total of eight corpses found in various stages of decomposition . A woman 's body was found March 29 off Ocean Parkway , west of Cedar Beach , police said . When medical examination determined they were not Gilbert 's remains , the police continued to search . On Monday , they found the remains of three additional people . They have also since been determined not to be those of Gilbert , police said in a statement Tuesday . Gilbert 's sister , Sheree Gilbert , told HLN 's Nancy Grace Tuesday night she was surprised none of the victims were her sibling . `` When we at first found out in December the first body initially they had found could have been hers , we had already prepared ourselves , and we were just hoping the search would come to an end , '' Sheree Gilbert said . `` We just do n't know where she is at this point and we do n't want her to suffer . We do n't want her to be lost somewhere , not ever found . '' Police say the hunt for a potential serial killer continues , as does the search for Gilbert , who , like the women whose bodies have been found , advertised for prostitution services on such sites as Craigslist . The first four bodies were discovered stuffed into bushes on a quarter-mile stretch of waterfront property on Oak Beach , indicating `` they were dumped there by the same person or persons , '' said Richard Dormer , Suffolk County Police commissioner , in December . `` It 's too coincidental that there were four bodies in the same location . '' The remains of the fifth body were found about a mile from where the other corpses were discovered , he said , refusing to disclose exactly where the three additional remains were found on Monday . Watch Nancy Grace Monday through Sunday starting at 8 p.m . ET on HLN . For the latest from Nancy Grace click here .
NEW : `` We do n't want her to suffer , '' says sister of missing woman . The remains of three women found do not include those of Shannan Gilbert . Total of 8 bodies found during monthslong search for a New Jersey woman . Several remains turned up so close together police believe same person `` dumped '' them .