William James Leahy
Agency patch
Police Officer

William James Leahy

End of Watch June 6, 2019
Age 49
Tour of Duty 26 yrs
Gender Male

Incident

Police Officer William Leahy died as the result of cancer that he developed following his assignment to the search and recovery efforts at the World Trade Center site following the 9/11 Terrorist Attacks.

Officer Leahy had served with the Port Authority of New York and New Jersey Police Department for 26 years and was assigned to John F. Kennedy International Airport.

Officer Leahy had served with the Port Authority of New York and New Jersey Police Department for 26 years and was assigned to John F. Kennedy International Airport.

September 11, 2001 - The Years After

Police Officer William James Leahy was assigned to the search and recovery at the World Trade Center site after September 11, 2001. He was 32 years old that fall.

He died on June 6, 2019 - 17 years and 8 months later - of an illness contracted there. He was 49.

He is one of 600 officers honored here, and one of 18 at Port Authority of New York and New Jersey Police Department.

The most recent of these deaths was October 24, 2025.

Officers who worked the search, rescue, and recovery at the World Trade Center site breathed contaminated air for weeks and months afterward. Many developed cancers and respiratory disease, and they have gone on dying of it ever since.

Seventy-two officers were killed on the morning itself. Hundreds more have died in the years that followed. They are honored here together, because the same attack killed them all. With some it simply took longer.

Survivors

He is survived by his parents.

In Our Keeping

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Stewardship
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Added to badge.nw
August 2, 2026
Last updated
August 2, 2026

Honored here by 1 tribute.

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Tributes

You walked into it and it took years to finish the job.
Police Officer Leahy gave the Port Authority of New York and New Jersey Police Department 26 years.
Thank you for your service to the Jersey City community. Gone but never to be forgotten.
Rest easy, Police Officer Leahy.

— S. Vincent Anthony, U.S. Army 1985-1993

Agency

Type Police Department
Location Jersey City, NJ
Platform Identity panynjpd.hudson.nj.us.gov.nw

Service Record

End of Watch June 6, 2019
Tour of Duty 26 yrs
Age 49
Gender Male

Incident Details

Cause Illness
Cause Detail 9/11 related illness
Weapon Aircraft; Passenger jet

The Sacrifice · Illness

William is one of 2,028 officers lost to illness in the United States, 7.4% of the 27,552 remembered there.

34,103 officers are remembered on this memorial. Each number below is one of them.

  1. See the roll
  2. See the roll
Compare against
I

Time

In 2019, 45 officers in the United States were lost to illness, the 9th heaviest of 108 years on record. The heaviest was 2021, with 564.

Every year on record · United States
II

Who

William was 49. Of the 1,996 lost to illness in the United States whose age is recorded, half were between 42 and 58; the middle age was 51. William had served 26 years; the middle length of service was 20 years.

Age at death
Where he stood among them
Age by years of service
III

When

June holds 4.9% of these deaths in the United States; October holds the most, 14.9%. Thursdays: 15.7%.

By month
By day of the week
IV

How

Illness deaths account for 7.4% of all 27,552 deaths in the United States, the 3rd most common cause. The weapon recorded was aircraft; passenger jet, in 29.5% of these deaths.

Every cause
Weapons recorded
V

His people

Port Authority of New York and New Jersey Police Department has 60 officers remembered here, William among them.

Across the years
VI

Where

Police Officer William James Leahy

Port Authority of New York and New Jersey Police Department · End of Watch June 6, 2019

Where the Name Is Cut

National Law Enforcement Officers Memorial · Panel 23-W

Also Remembered

National Law Enforcement Officers Memorial — requiem.nw →

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