Rex Heuermann was indicted for killing Maureen Brainard-Barnes, whose remains were found in marshland along Gilgo Beach

The accused Long Island serial killer Rex Heuermann has been indicted on a new murder charge in the killing of a fourth woman, Maureen Brainard-Barnes, who investigators believe was the first of the “Gilgo Four” to be killed, according to an indictment unsealed on Tuesday.

The unsealing of the indictment came after authorities announced Heuermann would face “a major development” in the investigation of the Gilgo Beach killings, which all targeted sex workers and lay unsolved for more than a decade.

Two women say they were concerned for safety during encounters with Rex Heuermann as investigators seek more information

As investigators continue to build their case against the accused Gilgo Beach serial killer Rex Heuermann, two Long Island sex workers have described the suspect as “violent” and “aggressive” during encounters they had with him.

The two women, who have not been identified, told members of an anti-human trafficking unit with the sheriff’s office in Long Island’s Suffolk county that they became concerned for their safety during encounters with the 6ft4in, 240lbs Manhattan architect.