Manhattan architect Rex Heuermann has pleaded not guilty to six counts of murder in connection with the infamous Gilgo Beach serial killings. The Suffolk County District Attorney’s office released charging documents on Friday confirming Mr Heuermann, of Massapequa, as the suspected serial killer who targeted sex workers and dumped their bodies along remote Long Island beaches. He appeared in court in handcuffs and wearing a polo shirt and khaki pants. Mr Heuermann was held without bail as prosecutors had previously sought, citing his recent searches for “sadistic materials, child pornography, images of the victims and their relatives.” The 59-year-old pleaded not guilty to three counts of murder in the first degree and three in the second degree over the deaths of Megan Waterman, Melissa Barthelemy and Amber Costello. The women are among the “Gilgo Four” whose bodies were found along a stretch of Ocean Parkway in Long Island in 2010. Court documents state that Mr Heuermann is also the “prime suspect” in the murder of the fourth woman in that group, Maureen Brainard-Barnes, though he is not facing charges related to her death. The documents outline a number of extremely disturbing searches in Mr Heuermann’s internet history, as well as burner phones he is accused of using to “taunt” his victims. The Gilgo Beach serial killer had previously been linked to as many as 11 victims discovered more than a decade ago in Suffolk County. Read More Gilgo Beach serial killer suspect arrested on suspicion of murders of 10 women on Long Island Police release haunting 911 call from woman later found dead as possible serial killer probe continues: ‘There’s somebody after me’ New police chief vows to close the case on Long Island’s unsolved Gilgo Beach murders