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Heuermann is charged with one count of second-degree murder in connection with the murder of Valerie Mack, according to a superseding indictment unsealed Tuesday.

Mack, whose remains were first found on Long Island in 2000. Mack, 24, had been working as an escort in Philadelphia and was last seen by her family that year in New Jersey.

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On Monday, Suffolk County District Attorney Ray Tierney released three new updated sketches of a Gilgo Beach victim.

The Asian male victim's remains were recovered along Ocean Parkway in April 2011. However, authorities say he was killed during or prior to 2006.

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Prosecutors turned over "voluminous" evidence to Heuermann's defense, including results from DNA lab work, data from Heuermann's electronic devices, and notes from searches of his home.

Heuermann has pleaded not guilty to killing multiple women.

His next court date is scheduled for October. No trial date has been set.

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Heuermann's adult children - and his now-estranged wife, Asa Ellerup, showed support at court.

Robert Macedonio, Asa's attorney, talked with Eyewitness News reporter, Chantee Lans, about what the past year has been like for the family.

"Complete shock. The world was turned upside-down in the last year."

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The new charges also significantly expand the timeline in the Gilgo Beach case, with the first murder Heuermann is accused of committing now taking place in 1993.

Prosecutors also revealed disturbing "planning" documents that they allege the suspect used in his killings and disposal of the victims.

The architect and father allegedly "meticulously planned and executed six separate murders," Suffolk County District Attorney Raymond Tierney said at a news conference Thursday.

Heuermann appeared before a judge on Long Island to face charges in the killings of Jessica Taylor and Sandra Costilla, two young women who were long suspected of being the victims of men preying on sex workers.

Listen to our latest "Eyewitness News to Gilgo Beach" episode and make sure you follow us to catch future episodes or listen to our archives explaining the case as only New York's Eyewitness News can.

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Heuermann has pleaded not guilty to killing four women -- Megan Waterman, Melissa Barthelemy, Amber Costello, and Maureen Brainard-Barnes - whose remains were found near Gilgo Beach along Ocean Parkway.

Suffolk County District Attorney Ray Tierney declined to comment.

Word of the new indictment follows searches by the Gilgo Beach Task Force at Heuermann's Massapequa Park home and a wooded area of Manorville where the remains of two women were previously found.

Heuermann had been scheduled to appear in court on June 18 but is now expected to be arraigned on the new charge on Thursday, June 6.

Listen to this breaking update in the latest installment of "Eyewitness to Gilgo Beach."

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Donna Sturman told investigative reporter Kristin Thorne she still has not gotten over the shock of the claims made against her former boss.

"It's traumatizing," she said. "It's so unbelievable."

Sturman worked for Heuermann from 2017 to 2018 at his architectural office in Midtown.

She said the irony is not lost on her that it was DNA from a discarded piece of pizza crust that prosecutors have used to tie Heuermann to the Gilgo Beach murders. He has plead not guilty to all the charges.

Listen to her story in the latest installment of "Eyewitness to Gilgo Beach."

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The amazing details of the investigation that finally collared a suspect in the longtime cold case.

Never miss a future episode of "Eyewitness to Gilgo Beach" - hit follow for all upcoming installments of our series.

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"This was an earthquake in Massapequa Park. This was a storm like they had never expected this," recalled Eyewitness News reporter Stacey Sager.

Rex Heuermann was arrested in Midtown Manhattan. He was initially charged in the deaths of Megan Waterman, Amber Lynn Costello, and Melissa Barthelemy.

Investigators also named him as the prime suspect in the death of Maureen Brainard-Barnes.

The next episode of "Eyewitness to Gilgo Beach" drops Thursday, March 14. Never miss an episode - hit follow for all future installments of our series.

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"As reporters were thinking, again, why do this now?" recalled Kristin Thorne. "They've had this video for so many years -- why now? And they said they want to keep the case going."

Then on May 9, 2022, Suffolk County Police released a 22-minute 911 phone call from Shannan Gilbert the night she disappeared in 2010.

"The 911 tape was sort of as advertised," said Einiger. "It was Shannan Gilbert sounding terrified running for her life."

The next episode of "Eyewitness to Gilgo Beach" drops Thursday, March 7. Never miss an episode - hit follow for all future installments of our series.

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Why did that collaboration not happen for so many years?

"It didn't happen because of politics. We had a police chief in Suffolk County, as well as a DA, that did not seem open to FBI involvement," recalled Kristin Thorne.

On Jan. 16, 2020, police released photos of a belt imprinted with the letters "H-M" or "M-H" to the public. Police say they believe the belt was handled by the suspect.

Two years later, Suffolk County Police Commissioner Rodney Harrison announced a new task force to investigate the Gilgo Beach murders.

The next episode of "Eyewitness to Gilgo Beach" drops Thursday, Feb. 29. Never miss an episode - hit follow for all future installments of our series.

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"What was the ultimate stunner in all of this is that they believed -- and still do believe -- that Shannan Gilbert was not murdered. That Shannan Gilbert died in an accidental drowning," recalled reporter Josh Einiger.

A few years later, Shannan Gilbert's mother, Mari Gilbert, who is credited for the discovery of the Gilgo bodies because of how she pushed for her daughter's search, is found stabbed to death in her apartment.

Chapter 6 of "Eyewitness to Gilgo Beach" drops Thursday, Feb. 22. Follow the podcast and never miss an episode.

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"This investigation started because Shannan Gilbert disappeared," said reporter Kristin Thorne. "It wasn't until Shannan Gilbert disappeared that her family started to hold police accountable and say -- you have to get out there and try to find Shannan Gilbert."

Investigators found a cell phone, lip gloss, shoes, and a pocketbook they say belonged to Shannan Gilbert on Gilgo Beach.

Yet they did not believe her death was related to the 10 bodies they found in the area.

Why?

Chapter 5 of Eyewitness to Gilgo Beach will drop on Thursday, Feb. 15. Follow our podcast and never miss an episode.

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Police found three more victims in the area between Oak Beach and Gilgo Beach, bringing the total count of victims to eight.

Investigators identified the victims as Jane Doe Number 6, a baby girl and an Asian man.

Investigators then say they believe they are looking for three, if not four, killers.

"This is around the time that it got complicated to tell this story," reporter Josh Einiger recalled.

We shed light on this complex stage of the story.

Chapter 4 of Eyewitness to Gilgo Beach drops Thursday, Feb. 8. Make sure you follow so you never miss an episode.

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"One of the most significant things I've ever heard at any kind of public official say, I think it was the first full day after that first report that we did," recalled Einiger. "There was a press conference with the man who was then the police commissioner. And he said something that to this day, I remember everything about what he said and how he said it."

Make sure you follow our podcast -- chapter 3 of Eyewitness to Gilgo Beach drops Thursday, Feb. 1.

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"We were on our way back and we got a call from the desk - saying 'there's a crime scene, there's a maybe body discovered', way down south on Ocean Parkway. Go check it out," Einiger said.

When they arrived at the scene, it was cold and pitch black. There were four crime scenes along the beach and spotlights set up.

"It was clear at that point that it was something," recalled Einiger.

Nobody quite understood it was something that we'd be talking about over a decade later.

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