Man fatally stabbed his ex-girlfriend after becoming obsessed while living in the same apartment building, vowed 'I'm going to kill her,' cops say

A man in Connecticut had allegedly become obsessed with his ex-girlfriend before plotting to stab her to death and then carrying out the fatal act, according to authorities.

Matthew Almontes, 41, has been charged with murder over the death of 41-year-old Tisha Marinoccio, the New Haven Police Department announced.

The defendant also faces a charge of tampering with evidence, and he is being held in jail on a $1.5 million bond.

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Almontes and Marinoccio apparently lived in the same building on the 300 block of Orange Street in New Haven. The pair had dated but were no longer in a relationship at the time of the violence, police said.

An employee at the apartment building said Almontes had been discussing stabbing the victim in the past six months, according to a police report obtained by the New Haven Register.

On Monday, the defendant allegedly told the worker, “I’m going to kill her. I’m gonna stab her and they’re not gonna find a weapon.”

The employee added that Almontes had become obsessed with Marinoccio and was going through “mental deterioration,” police said.

On Wednesday, police said the woman called them, saying she had been stabbed by her ex-boyfriend — identified as Almontes — adding that he left her apartment with the weapon. “Upon arrival, they located Marinoccio inside her apartment suffering from a stab wound.”

Paramedics brought her to a local hospital, where she was pronounced dead.

Officers searched the area outside, found Almontes, and detained him.

“They also located the knife he used inside a dumpster in the rear alley of the apartment building,” the law enforcement agency said.

Police allegedly looked through surveillance footage and found the suspect “entering and exiting the victim’s apartment as well as exiting the rear of the apartment building, where he discarded an unknown object inside the rear-alley dumpster.”

The defendant apparently declined to speak with investigators. He is scheduled to appear in court on Aug. 26.

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