A Bronx woman brutally stabbed to death by her “monster” boyfriend of six years was planning to break off their violent relationship before their final and fatal meeting, the victim’s sisters told the Daily News.

The couple were already living apart when Zariah Hayes, 23, went to meet with her killer at his apartment in the Allerton section Thursday night, where an argument escalated in to homicide in an instant as suspect Shaheene Ahmad stabbed her numerous times in the neck and head.

Hayes died at Jacobi Medical Center, and police said the 35-year-old suspect was standing alongside the corpse when cops arrived at his mother’s apartment.

“I felt like he knew he couldn’t have Zariah anymore,” sibling Zeniya Hayes, 23, said Saturday. “I know his intent was to kill. He’s a monster and should never be let out. He should get everything he deserves.”

Sister Kiara Vargas, 27, said Ahmad began wooing the victim when she was only 17 years old, with their relationship quickly becoming abusive as she helped raise their now 2-year-old son and his 5-year-old son from another relationship. Zariah’s little boy had just celebrated his birthday this past Thursday.

“He was abusing her while she was pregnant and after,” recalled Vargas. “He punched her in the face, he choked her in front of the kids multiple times …The devil is alive, because that’s him. The devil is him.”

A Bronx Criminal Court complaint indicated Ahmad made incriminating statements once in custody, and one of the victim’s sisters said Zariah once had a restraining order against her boyfriend in the years after the couple first met on Instagram.

Ahmad also had one prior arrest for strangling Hayes in a fit of jealousy on July 28, 2022, after she went out with her friends. The couple began arguing, with Ahmad accusing her of cheating before grabbing her by the throat, according to police sources. The accused killer also smacked her around, causing bruises to both sides of her head and throat, the sources indicated.

Zeniya Hayes described the accused killer as an absentee dad who left her sister alone to raise both boys while she also worked full-time to support the family. And Vargas said his violent behavior was well known, with her sister finally ready to move on.

“She was done but trying to figure out how to leave the situation,” said Vargas. “Unfortunately, we knew he was capable of this. My sister knew he was capable of this … I feel like he lost a grip on her and that’s when he decided to do this. I feel like this is something he wanted to do, he planned this. He did this at a time where she was ready to leave.”

The victim’s little boy slept through the deadly stabbing, while the accused killer’s son was in the home and witnessed the killing, the sisters said.

“He wasn’t doing anything for his kids,” said Zeniya Hayes. “Zariah was very independent, hardworking, smart, very intelligent. I know his intent was to kill … Our sister didn’t deserve any of this.”