The family of alleged Gilgo Beach serial killer is speaking out in an all-new documentary on Peacock. 

The Gilgo Beach Killer: House of Secrets, debuting on June 10, is set to provide an in-depth look into Heuermann’s Long Island residence and feature insights from his spouse, children, and acquaintances as they grapple with the startling accusations leveled against the Manhattan-based architect, alleged to have murdered seven women.

“Following the arrest of the supposed Gilgo Beach murderer, this documentary offers a first-time glimpse inside the suspect’s domicile, where exclusive input from his family reveals a disturbing image of a man accused of leading a duplicitous life, concealing ominous secrets within their very walls,” states a press release concerning the three-part documentary. 

A brand-new trailer released on Friday for the feature showcases Heuermann’s estranged wife, Asa Ellerup, seated in their family home, being asked by a producer, “How could you not know?” 

Although Ellerup’s answer isn’t revealed, she later opens up about the moment she learned of the stunning allegations against her husband. 

“The investigator says to me, ‘Have you heard about the murders on Gilgo Beach?’ I’ve heard of them,” Ellerup remarked, before adding,  “Does everybody really believe everything they hear?” 

It’s clear in the more than a minute long trailer that some of those close to Heuermann now have conflicting feelings about the man they thought they once knew.

“One person’s saying this, one person’s saying that, but my memory says this,” his daughter, Victoria, said in another clip.

She isn’t the only one who appears to be questioning Heuermann, as another man who described himself as Heuermann’s “best friend” described the moment he confronted the alleged killer.  

“There’s so much evidence against you, I don’t even believe you and you’re my best friend,” he said as he recounted the conversation. “Convince me, give me something. Did you do it?”

The final moments of the trailer also revealed a seemingly typical conversation between the husband and wife as Heuermann called Ellerup from behind bars.

“Hello,” Heuermann can be heard saying in the call. 

“How you doing?” Ellerup asks. 

“Alright, how are you today?” Heuermann calmly replies.

“I’m doing great, now that I’ve got you on the phone,” Ellerup tells him as the camera pans to a photo of the couple as young newlyweds.

About the suspected victims of the Gilgo Beach Killer

In addition to exclusive multi-part interviews with Ellerup, Victoria and Heuermann’s close friend, the Peacock documentary will also delve into the lives of Heuermann’s alleged victims before they met their tragic fate and follow the investigation that led to his eventual arrest. 

The unassuming architect was taken into custody in July 2023 and was initially charged with second-degree murder for the deaths of three women: Melissa Barthelemy, Megan Waterman, and Amber Costello.

The remains of all three women were found along the same stretch of Gilgo Beach in December 2010 in a harrowing case that sparked national attention and inspired the 2020 Netflix film Lost Girls.

After his arrest, authorities later linked Heuermann to the deaths of four other women in separate cases that date all the way back to 1993. 

While Heuermann remains behind bars awaiting trial for the killings, The Gilgo Beach Killer: House of Secrets will take a new look at the case and reveal new details about the man behind the disturbing allegations. 

The three-part documentary is produced by Curtis “50 Cent” Jackson’s G-Unit Film and Television,

The special will premiere Tuesday, June 10 on Peacock, with all three episodes available to stream upon its release.