OAK BEACH - Two years ago to the day after Shannan Gilbert went missing in Oak Beach, her mother and sisters met with the Suffolk County Medical Examiner. A lawyer for Gilbert's mother says the results of the autopsy report they received today are inconclusive. Originally, police had said they believed Gilbert had drowned in the swampy area of Oak Beach. However, the attorney says the report contains no evidence of that. The report shows that Gilbert had no traces of cocaine in her system, although the Gilberts' lawyer says that was the only drug her remains were tested for. Gilbert's mother, Mari, said after the meeting that she's "more frustrated and angry than ever." She was hoping for something more substantial, but instead, she says she feels betrayed by investigators. Gilbert was last seen running from a client's Oak Beach home on May 1, 2010. Her disappearance triggered the hunt for a possible serial killer who dumped as many as 10 sets of human remains along Ocean Parkway. Police believe they found remains of missing NJ woman VIDEO: News conference on Shannon Gilbert discoveryLI police come up empty-handed after search for Jersey City womanPolice find purse, other items belonging to missing NJ prostitute