A helpless 7-year-old girl was tortured to death in a Long Island house of horrors by three generations of women — and was so badly battered that she died with 90 stab wounds on her body, prosecutors said.

Little Jor’Dynn Duncan was terrorized for at least a year inside the Bayport home, where 50-year-old Emily Kelly — who had been given custody of the child — and her mother and daughter allegedly abused the girl until her tiny body gave out, Suffolk County prosecutors said Wednesday.

Kelly is now charged with second-degree murder, while her mom, Barbara Renner, 75, and daughter, 24-year-old Elyssa Seymore, also charged in the prolonged child abuse.

Jor’Dynn Duncan, 7, was “abused and tortured” for at least a year inside a Long Island home. Suffolk County District Attorney 

“This was not an alleged single act of violence,” Suffolk County District Attorney Ray Tierney said in a statement. “It was months of alleged systematic cruelty and sadistic abuse, meticulously documented.

“The child was allegedly left to die while these defendants watched her deteriorate,” Tierney said. “No child should ever endure such horror, and we will seek justice for Jor’Dynn.”

Jo’Dynn, whose father is Kelly’s fiancé, was placed in the home by Child Protective Services in December 2024 — with the accused killer getting custody and guardianship in April 2025.

Emily Kelly, 50, is charged with murder while her mother rand daughter are also charged in Jor’Dynn Duncan’s death. Emily Kelly / Facebook

But over the court of the year, the girl repeatedly missed 40 days of school, with Kelly and her kin making up excuses ranging from illnesses and deaths in the family to a made-up trips to Disneyworld.

On Dec. 29, police got a 911 call at the house claiming Jo’Dynn suffered cardiac arrest — with the girl rushed to NYU Langone Hospital in Suffolk County, where she was pronounced dead.

Police launched an investigation after an autopsy revealed that the girl died as a result of a massive untreated infection from “sharp force injuries” dating to at least January 2025 — with about 90 wounds on her body, according to prosecutors.

On Wednesday, Kelly was charged with murder, reckless endangerment, unlawful imprisonment and endangering the welfare of a child and ordered held on $5 million cash bail or a $10 million bond.

Suffolk County DA Ray Tierney called “Jor-Dynn Duncan’s horrific death the result of “systematic cruelty.” Brandon Cruz/NY Post

Renner was charged with second-degree manslaughter and endangering the welfare of a child, and is being held on $50,000 cash or a $500,000 bond.

Seymore is charged with unlawful imprisonment and endangering the welfare of a child, and was ordered held on $25,000 cash bail or a $250,000 bond, the DA’s office said.