The son of a victim of the accused Gilgo Beach serial killer has filed a lawsuit against Rex Heuermann and members of his family over the alleged torture and dismemberment of his mother – just days before he is expected to plead guilty to the brutal killings of seven women.
On Monday, attorney John Ray filed a wrongful death lawsuit on behalf of Benjamin Torres, the only child of Valerie Mack, according to court documents obtained by Fox News.
The civil filing alleges that Mack’s death deprived Torres of his "mother’s care, guidance, protection, nurture, society and economic support."
"We're bringing this lawsuit on Benjamin's behalf in order to do several things," Ray told Fox News Digital. "One of which is to hold responsible the people who have done harm to Benjamin from the Heuermann family."
Ray added the lawsuit is "also to learn the full truth" surrounding what happened to Mack, "which will not be learned when Mr. Heuermann pleads guilty tomorrow."
Mack, a 24-year-old from Philadelphia, vanished when her son was just 6 years old in 2000. Her partial remains were discovered in Manorville, New York, after a group of hikers stumbled upon a suspicious black bag that November.
According to the lawsuit, Mack was "tortured ferociously" before allegedly being killed and dismembered by Heuermann.
As a result, Torres is seeking unspecified "recovery for the wrongful torture and murder of Valerie Mack, for the terror, restraint, pain, mutilation, and dismemberment inflicted upon her before and after death, for the concealment and mutilation of her remains, and for the profound and prolonged harm thereby inflicted," the lawsuit said.
The suit also aims to seek compensation from Heuermann’s ex-wife, Asa Ellerup, and daughter Victoria Heuermann stemming from profits made from the Peacock documentary, "Gilgo Beach Killer: House of Secrets."
The family received over $1 million from the documentary, according to wrongful death lawsuits to be filed, arguing the limit should be waived for Torres due to his age at the time of his mother’s murder and authorities’ delay in identifying her remains.
He is expected to plead guilty to all seven counts of murder as part of a plea deal offered by Suffolk County District Attorney Ray Tierney. He is due back in court on Wednesday.
Heuermann is accused of killing Mack, Megan Waterman, Melissa Barthelemy, Maureen Brainard-Barnes, Jessica Taylor, Sandra Costilla and Amber Lynn Costello.
Tierney, and the attorneys for Heuermann and Ellerup did not immediately respond to Fox News Digital’s request for comment. Ellerup's attorney is expected to address the lawsuit at a 4 p.m. news conference.
Fox News' Jennifer Johnson and Michael Ruiz contributed to this report.