Luis Marquez, 41, was indicted for the murder of his ex-girlfriend Carmen Lopez, 47, in Harlem, NYC. Marquez stalked Lopez during a night out, waited over two hours in the stairwell of her apartment building, and fatally stabbed her more than 20 times as she returned home. The attack occurred on November 10, 2025, and Marquez was arrested the following day. The prosecution alleges intimate partner violence with a history of an on-again, off-again relationship lasting about five years. Marquez claimed blackout intoxication and memory loss of the event. Lopez was a mother of four, with two children asleep nearby during the attack.
Country: United States
State/Province: New York, United States
City/Region: Harlem
Incident Type: Domestic Violence Homicide
Relationship Status: Ex-partners
Relationship Duration: Approximately 5 years
Incident Date: Nov. 10, 2025
Relationship Origins:
Relationship Stages:
Contributing Factors:
Red Flags:
Motives:
Relationship Outcomes:
How the relationship or connection began.
Approximately 5 years
Important relationship phases recorded for this case.
Reported red flags or early concern points.
Contributing factors and possible motives from the available sources.
2025-11-10
Recorded relationship or case outcome.
English labels are shown first. Original-language titles are preserved for source verification.
Original language: English
D.A. Bragg Announces Murder Indictment Of Luis Marquez For Fatally Stabbing Ex-Girlfriend - Manhattan District Attorney's Office
Jealousy
The case involves an on-again, off-again romantic relationship marked by jealousy and stalking behavior. The suspect stalked the victim during a night out and ambushed her in a stairwell, fatally stabbing her multiple times. The violence escalated from prior intimate partner conflict, culminating in a fatal attack after a period of separation.
The Manhattan District Attorney's Office indicted Luis Marquez for second-degree murder. The prosecution is led by the Intimate Partner and Sexual Violence Bureau with support from investigative analysts and NYPD detectives. Surveillance footage and witness statements corroborate the timeline. Marquez was arrested after confessing to relatives and undergoing psychiatric evaluation. The case remains pending trial.
Marquez claimed blackout intoxication and memory loss, complicating motive clarity. No suicide or murder-suicide indicators were reported. The exact relationship dynamics prior to the incident remain partially unclear.
Marquez stalked Lopez during her night out on November 9, 2025, then waited in the stairwell of her Harlem apartment building for over two hours. At approximately 4 a.m. on November 10, he ambushed her as she exited the elevator, pinned her down, and stabbed her more than 20 times. Lopez's body was found about 15 minutes later. Marquez returned to his Bronx residence, confessed to relatives, and was arrested the next day. The prosecution alleges a history of jealousy and intimate partner violence in their five-year on-and-off relationship.
High risk due to stalking, repeated harassment, and escalation to lethal violence. The suspect's jealousy and prior relationship instability were significant risk factors.
Early stalking and jealousy behaviors are critical warning signs. The escalation from harassment to lethal violence can occur rapidly, especially in on-again, off-again relationships. Intervention by specialized intimate partner violence units is essential for prevention.
Stalking during the victim's night out and the suspect waiting in the stairwell for hours were key early signals.
Surveillance footage, witness statements, and the suspect's confession helped connect the case.
Video surveillance and forensic evidence of multiple stab wounds were strongest.
Neighbors and coworkers described the suspect as quiet but jealous. Relatives reported the suspect's confession. Maintenance worker found the victim's body. Not reported any eyewitnesses to the stabbing itself.
No follow-up reports available beyond initial indictment and arraignment details.
The suspect's blackout claim and memory loss leave some motive and intent aspects unclear.