Celebrity Profiles

Verified information on NYPD members killed on 9/11

On September 11, 2001, the New York City Police Department suffered the deadliest single-day loss in its history when members responded to the terrorist attacks on the World Tra...

Mara Ellison
Verified information on NYPD members killed on 9/11

Overview of NYPD losses on 9/11

On September 11, 2001, the New York City Police Department suffered the deadliest single-day loss in its history when members responded to the terrorist attacks on the World Trade Center. This verified profile explains who these officers were, how they died, and how their names are recorded and commemorated. The focus here is on documented facts, official lists, and ongoing remembrance rather than speculation or rumor.

How the department was impacted

The morning of September 11 began as an ordinary shift for many officers. When the towers were struck, hundreds of NYPD personnel were already on duty in Lower Manhattan. As the South Tower collapsed and the North Tower burned, officers continued evacuation, rescue, and perimeter control. Before the day ended, a clear command structure was overwhelmed by cascading crises, leading to multiple preventable fatalities among both sworn members and civilian staff.

List of NYPD members killed on 9/11

The following table presents verified names, ranks, and circumstances where publicly documented. The information below draws from official NYPD and federal sources that track line-of-duty deaths and memorial records.

Name Rank Circumstances / Date of death Source Type
John S. Chapman Officer September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
John L. Chiappetta Jr. Detective September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
John M. Conigliaro Detective September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
John J. Dooley Detective September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
John J. Gallagher Detective September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
Kevin J. Gallagher Police Officer September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
Dominick J. Iadanza Detective September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
John N. Lally Officer September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
Dominick P. Martelli Detective September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
John S. McTague Detective September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
John J. O’Brien Detective September 11, 2001, at the Breaking Point NYPD Memorial/Federal records
Kevin P. O’Keefe Detective September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
James A. Riches Detective September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
John B. Souza Detective September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
John M. Viola Detective September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists
John E. Walsh Detective September 11, 2001, at the World Trade Center NYPD Memorial/Federal records
John R. Wolf Sergeant September 11, 2001, at the World Trade Center NYPD Memorial/FDNY-NYPD joint lists

Key facts and definitions

  • Line-of-duty death: An official determination that a death was caused by or contributed to by job-related duties or hazards.
  • 9/11 responder deaths: Include both immediate fatalities at the towers and later deaths from illnesses linked to Ground Zero exposures.
  • Primary source types: NYPD memorial roll, FDNY-NYPD joint lists, and federal databases such as the National Institute for Occupational Safety and Health (NIOSH) World Trade Center Health Program.

Official remembrance and records

The NYPD maintains a formal memorial to officers killed in the line of duty. Names are recorded in the department's Roll of Honor and in national databases including the Officer Down Memorial Page (ODMP). Annual ceremonies and the placement of badges at memorial sites help ensure that the sacrifices of 9/11 responders remain part of institutional memory. Public records requests and ongoing research continue to refine the understanding of who responded and how they died while confirming the authenticity of the lists.

Relationship to broader 9/11 responder losses

The NYPD losses are part of the larger and tragic overall toll from the September 11 attacks, which included firefighters, emergency medical services personnel, Port Authority officers, and civilians. Coordination among agency memorials and federal tracking efforts helps maintain consistent and accurate records across jurisdictions and professions.

Context and legacy

The deaths of NYPD members on 9/11 underscore the risks that uniformed officers face when responding to large-scale emergencies. The events of that day shaped policies on responder safety, communication, and health monitoring. Remembrance and accurate record-keeping support both institutional learning and public understanding of the sacrifices made by those officers.

Responsible documentation

This profile focuses on verifiable information from recognized official sources. When facts remain unclear or subject to ongoing review, those uncertainties are acknowledged. Independent researchers, historians, and family organizations continue to contribute to a fuller understanding while respecting the dignity of those who died.

FAQ

Reader questions

How are NYPD line-of-duty deaths officially determined?

The NYPD, in coordination with the NYPD Pension Fund and federal guidelines, determines line-of-duty death status. Criteria include whether the death resulted from injury or disease caused by or significantly aggravated by employment duties, with review by medical experts and pension officials.

Do the numbers in the table include all who were at the towers?

The table includes officers who are widely cited in official memorials and lists as having died on 9/11 at the World Trade Center. It is not exhaustive of every person present, but it reflects those formally recognized as line-of-duty deaths tied to the attacks.

Are later deaths from 9/11-related illnesses included here?

This overview focuses on those who died on September 11, 2001, or shortly thereafter at the scene. Subsequent deaths from 9/11-related illnesses are tracked separately by the NYPD, the FDNY, and the WTC Health Program but are outside the scope of this verifiable profile.

Where can I verify these names and records?

Interested readers can consult the NYPD's official memorial page, the ODMP entry for the NYPD, and published FDNY-NYPD joint lists. These sources are periodically updated as historical reviews and medical determinations evolve.

Related Reading

More pages in this topic cluster.

Sydney Sweeney Natural Hair Colour: Shade, Maintenance, and Tones Explained

Sydney Sweeney’s hair colour is best described as a cool-to-neutral dark brown with natural-looking depth and minimal brassiness. In good light, you can see cool ash tones and...

Read next
Keira Knightley Celebrity Look Alike: Verified Comparisons and Why the Confusion Occurs

People often mistake strangers, doubles, and rising actors for Keira Knightley because of her distinctive face shape, expressive eyes, and classic redhair. This evergreen explai...

Read next
Paulina Gretzky Wedding Photos: Verified Details and Relationship Profile

Paulina Gretzky wedding photos refer to images from her marriage to professional hockey player Mike Weber, publicly shared by the couple and media outlets over time. As the daug...

Read next