Rex Heuermann, a New York architect, pleaded not guilty Friday to six counts of murder in connection with the deaths of three of the four women known as the "Gilgo Four". The charges relate to the deaths of Melissa Barthelemy, Megan Waterman, and Amber Costello. A fourth woman, Maureen Brainard-Barnes, was found in the same spot, alongside the other victims, and authorities say Heuermann is also the prime suspect in her death. Their bodies were all found near Gilgo Beach on Long Island’s South Shore back in December 2010. After Heuermann’s court appearance, he was remanded without bail. He has been charged with three counts of murder in the first degree and three counts of murder in the second degree, according to an indictment filed in the case. Suffolk County District Attorney Raymond Tierney talks with Anderson about the investigation and former FBI Senior profiler Mary Ellen O'Toole shares what stands out about this suspect. 

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