Gilgo Beach serial killer Rex Heuermann, who pleaded guilty to murdering eight women on Long Island over the course of nearly two decades, admitted to his now ex-wife that he killed seven of the women in their home, she said in a new documentary.

Heuermann, who originally pleaded not guilty to seven murders, changed his plea to guilty on April 8 and also confessed to an eighth murder. The 62-year-old architect killed the women between about 1993 and 2010, according to his admissions.

Asa Ellerup, who was married to Heuermann for 27 years and filed for divorce in 2023 after he was arrested and received the first charges for three of the murders, revealed in the documentary "The Gilgo Beach Killer: House of Secrets" on Peacock that her husband confessed to the killings to her.

"He looked very nervous. Very, very nervous," Ellerup said in the preview shared by Peacock. "He said he killed eight women."

"He said I wasn't home during all of them," Ellerup said. Prosecutors have said she and her daughter were out of town during many of the murders.