NYC mom stabbed ’50 times,’ left to die by deranged ex who lurked in NYC stairwell for hours: sources

A mom was stabbed and left to die inside a Harlem building by her ex-boyfriend – who waited to ambush her for hours and unleashed his attack even as she begged him to stop, sources and workers said.

The unidentified 47-year old mother-of-four cried out her attacker’s name as he stabbed her multiple times, then left her lying in the blood-spattered hallway of a six-story rental building on West 129th Street early Monday, according to law enforcement sources and building employees.

A porter called 911 upon spotting the woman drenched in blood and clinging to final gasps of life near the elevator on the third floor of the building around 4:25 a.m., cops and sources said. 

Lyron Middleton said he found the building resident – who has a teenage autistic son – as he cleaned the staircase.

“I saw the blood as I got up close to her,” Middleton told The Post “I thought it was just someone lying on the floor.”

Responding EMS workers rushed the critically injured woman to Mount Sinai Morningside hospital, where she died from her wounds, cops said. 

Middleton said his boss tried to show him surveillance video that captured the savage attack, but he couldn’t bear to watch it and only listened to the audio.

“She was yelling out someone’s name as it was happening,” he said of the footage. 

“She said, ‘Luis, Luis, Luis. Luis stop, Luis stop,’” he said. 

A police source who viewed the video said the enraged attacker knifed the victim in her face, head and neck.

“He must have stabbed her 50 times,” the source said.

It appeared the assailant sat on the building staircase for two hours — beginning at 2 a.m. — before he pounced when she showed up at 4 a.m., Middleton said. 

“He must have been waiting for her,” he said.

A male person of interest — described as the victim’s ex-boyfriend — was in custody by the afternoon, but was not immediately charged, sources said.

A building superintendent told reporters that the victim had four kids, two who live with her and two who are older and live in New Jersey. 

“I don’t know how did this happen, because they are not a problem person, any one of them. They are nice [people], like our family,” the worker said.

A rattled neighbor described the murder as “a sad situation knowing she had children.”

“I just see the whole damn police out here this morning,” the resident said. “I was shocked. That has never ever happened in this building and I’ve been here for ten years. I’m really shocked.”