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Connecticut man charged with murder after allegedly threatening ex-girlfriend for months

New Haven police arrested Matthew Almontes for the fatal stabbing of Tisha Marinoccio following reports that the suspect had threatened the victim for months.

Published August 16, 2026 at 6:12 PM EDT

The short answer

New Haven police arrested Matthew Almontes for the fatal stabbing of Tisha Marinoccio following reports that the suspect had threatened the victim for months. The New Haven Police Department arrested 41-year-old Matthew Almontes on Wednesday following the fatal stabbing of his former girlfriend, Tisha Marinoccio, 41. Almontes faces charges of murder and tampering with evidence in connection with the incident at an apartment complex on…

Connecticut man charged with murder after allegedly threatening ex-girlfriend for months

The Facts

Who
Matthew Almontes, Tisha Marinoccio, and the New Haven Police Department.
What
The arrest and charging of Matthew Almontes for the murder of Tisha Marinoccio.
When
Wednesday, August 12, 2026
Where
New Haven, Connecticut
Why
Almontes was arrested for murder after a six-month period of alleged threats reported by a witness.

Timeline of what happened

Key dates and decisions, in the order they occurred.

  1. August 10, 2026

    Suspect allegedly makes direct threat to building employee

  2. August 12, 2026

    Tisha Marinoccio fatally stabbed; Matthew Almontes arrested

  3. August 26, 2026

    Scheduled court appearance for Almontes

The New Haven Police Department arrested 41-year-old Matthew Almontes on Wednesday following the fatal stabbing of his former girlfriend, Tisha Marinoccio, 41. Almontes faces charges of murder and tampering with evidence in connection with the incident at an apartment complex on Orange Street.

Police responded to the scene after Marinoccio placed a distress call reporting that her ex-boyfriend had stabbed her and fled the premises. Emergency responders transported Marinoccio to a local hospital, where she was later pronounced dead. Both the suspect and the victim lived in separate units within the same building.

According to police records obtained by the New Haven Register, an employee at the apartment complex informed investigators that Almontes had spoken about stabbing Marinoccio for approximately six months. The worker reportedly told police that Almontes had become obsessed with the victim and was showing signs of mental deterioration. On the Monday prior to the stabbing, Almontes allegedly told the employee he intended to kill Marinoccio and hide the weapon.

Security camera footage from the property showed a suspect entering and exiting Marinoccio's apartment before leaving through the back of the building to discard an object in a dumpster. Officers reported finding the knife used in the attack inside that dumpster. Almontes was located nearby and taken into custody, where he declined to speak with investigators.

For the family of Tisha Marinoccio and the accused, the day-to-day impact involves the immediate loss of life and the initiation of a high-stakes criminal trial. Local residents may notice increased security or police presence at the 300 block of Orange Street as the investigation continues. The legal proceedings will determine whether Almontes is held responsible for the two felony charges, which carry significant prison sentences upon conviction.

The case sets a local precedent regarding how witness reports of "mental deterioration" and specific threats are documented by property management and handled by law enforcement. The recovery of evidence from a dumpster and the use of building surveillance footage will likely be central to the prosecution's arguments. Almontes is scheduled to make his next court appearance on Aug. 26 to address the charges of murder and tampering with evidence.

Summaries are written by The Plain Record to state the facts of a story plainly and without political slant. See our editorial standards, or report a correction.

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Questions readers ask

What happened: Connecticut man charged with murder after allegedly threatening ex-girlfriend for months?

The arrest and charging of Matthew Almontes for the murder of Tisha Marinoccio.

Who is involved?

Matthew Almontes, Tisha Marinoccio, and the New Haven Police Department.

When did this happen?

Wednesday, August 12, 2026

Where did this happen?

New Haven, Connecticut

Why does this matter?

Almontes was arrested for murder after a six-month period of alleged threats reported by a witness.