Accused Gilgo Beach serial killer Rex Heuermann is expected to be charged Tuesday with a fourth count of murder for the death of Maureen Brainard-Barnes, according to a report.
Suffolk County District Attorney Raymond Tierney will announce the new charges once they are unsealed in court in Riverhead, according to NBC News.
Heuermann, 60 was named the prime suspect in Brainard-Barnes’ murder when he was charged over the other so-called “Gilgo Four” slayings of sex workers found strewn on the Long Island beach within days in December 2010.
Brainard-Barnes, who disappeared in 2007 when she was 25, was found bound by a distinctive belt stamped with the initials “WH” or “HM” — which could have belonged to Heuermann’s grandfather, William Heuermann, prosecutors have previously argued.
Heuermann, a New York City architect and married dad of two, was arrested this past July in connection to the notorious “Gilgo Four” case.
Authorities were able to pinpoint Heuermann as the suspect after DNA from the hair of victim Megan Waterman matched that of his, taken by investigators from a discarded pizza crust in January.
Heuermann was charged with murdering Waterman, 22, Melissa Barthelemy, 24, and Amber Lynn Costello, 27, whose remains were found wrapped in burlap within days of each other near where Brainard-Barnes was found.
All four women are believed to have been advertising as sex workers when they vanished between 2007 and 2010.
The years-long investigation that led to the arrest revolved around the discovery of more than 10 sets of human remains along Ocean Parkway near Gilgo Beach in Suffolk County between December 2010 and April 2011.
His arrest also comes after Suffolk County created a special Gilgo Beach Homicide Investigation Task Force in February 2022.
Neither Tierney’s office nor a lawyer for Heuermann immediately returned The Post’s requests for comment early Monday.