Santa Clara Officer Cleared in Fatal Shooting of Roommate Attacker

District Attorney says officer lawfully used lethal force to stop knife assault.

Apr. 13, 2026 at 5:06am

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An extreme close-up of a broken kitchen knife blade reflecting a harsh, direct camera flash, conceptually representing the violent confrontation between the suspect and victim.A violent home attack exposes the difficult choices facing police officers when confronted with imminent threats of lethal force.Santa Clara Today

The Santa Clara County District Attorney's Office has determined that a Santa Clara police officer lawfully shot and killed a man who was attacking his unarmed roommate with a kitchen knife last September. The officer fired multiple times after the suspect refused commands to stop the assault.

Why it matters

This case highlights the challenges law enforcement face in using lethal force, even when it appears to be justified to protect a life. The District Attorney's review and findings aim to provide transparency around the incident and affirm the officer's actions were within the law.

The details

On a September 2025 morning, Nizamuddin Mohammed, 32, suddenly started stabbing his unarmed, almost naked, and unsuspecting roommate during an argument about the thermostat. After kicking open the door and shouting several warnings, the responding officer saw Mohammed bring the knife toward the injured roommate's throat and fired multiple times, killing Mohammed. An autopsy showed no drugs or alcohol in Mohammed's system, but his roommates reported he had been acting erratically.

  • On September 3, 2025, at approximately 6:00 a.m., the attack occurred.
  • The District Attorney's review took several months before the findings were released on April 13, 2026.

The players

Nizamuddin Mohammed

A 32-year-old man who suddenly attacked his unarmed roommate with a kitchen knife.

Officer Robert Allsup

The Santa Clara police officer who responded to the scene, issued commands, and ultimately used lethal force to stop the attack.

The Roommate

The victim of the knife attack, who was unarmed and nearly naked when the assault occurred.

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What they’re saying

“if Officer Allsup had been a little bit later . . . I do not think I'd be here right now.”

— The Roommate

The takeaway

This incident highlights the difficult split-second decisions officers must make when confronted with threats of lethal violence. While the use of force was deemed lawful, it also raises ongoing questions about de-escalation tactics, mental health resources, and the appropriate use of deadly force by law enforcement.