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 about 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 — along with 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 mother, Barbara Renner, 75, and her daughter, 24-year-old Elyssa Seymore, are also charged in the prolonged child abuse case.

“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.”

Jor’Dynn, whose father is Kelly’s fiancé, was placed in the home by Child Protective Services in December 2024. Kelly was granted custody and guardianship in April 2025.

Over the course of the year, the girl repeatedly missed about 40 days of school, with Kelly and her relatives making up excuses ranging from illnesses and deaths in the family to fabricated trips to Disney World.

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

An autopsy later revealed that she died from a massive untreated infection caused by “sharp force injuries” dating back to at least January 2025, with approximately 90 wounds found on her body, according to prosecutors.

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

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

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