New York City Police Department, New York
End of Watch Saturday, August 25, 2012
John F. Kristoffersen
Detective John Kristoffersen died from illnesses he contracted after inhaling toxic materials as he participated in the rescue and recovery efforts at the World Trade Center site following the terrorist attacks on September 11, 2001.
Detective Kristoffersen had served with the New York City Police Department for 28 years and was assigned to the Brooklyn North Homicide Squad.
On the morning of September 11, 2001, seventy-two officers from a total of eight local, state, and federal agencies were killed when terrorist hijackers working for the al Qaeda terrorist network, headed by Osama bin Laden, crashed two of four hijacked planes into the World Trade Center towers in New York City. After the impact of the first plane, putting the safety of others before their own, law enforcement officers along with fire and EMS personnel, rushed to the burning Twin Towers of the World Trade Center to aid the victims and lead them to safety. Due to their quick actions, it is estimated that over 25,000 people were saved.
As the evacuation continued, the first tower unexpectedly collapsed due as a result of the intense fire caused by the impact. The second tower collapsed a short time later. 71 law enforcement officers, 343 members of the New York City Fire Department and over 2,800 civilians were killed at the World Trade Center site.
A third hijacked plane crashed into a field in rural Pennsylvania when the passengers attempted to re-take control of the plane. One law enforcement officer, who was a passenger on the plane, was killed in that crash.
The fourth hijacked plane was crashed into the Pentagon in Arlington, Virginia, killing almost 200 military and civilian personnel. No law enforcement officers were killed at the Pentagon.
The terrorist attacks resulted in the declaration of war against the Taliban regime, the illegal rulers of Afghanistan, and the al Qaeda terrorist network which also was based in Afghanistan.
On September 9, 2005, all of the public safety officers killed on September 11, 2001, were posthumously awarded the 9/11 Heroes Medal of Valor by President George W. Bush.
The contamination in the air at the World Trade Center site caused many rescue personnel to become extremely ill, and eventually led to the death of several rescue workers.
On May 1, 2011 members of the United States military conducted a raid on a compound in Abbottabad, Pakistan where Osama bin Laden was hiding. During the raid, they shot and killed bin Laden.
Please click here to visit the memorials of all of the law enforcement officers killed in this terrorist attack.
Bio
- Age 50
- Tour 28 years
- Badge Not available
Incident Details
- Cause 9/11 related illness
- Incident Date Tuesday, September 11, 2001
- Weapon Aircraft; Passenger jet
- Offender 19 suicide attackers
Most Recent Reflection
View all 7 ReflectionsAnother year in the kingdom of Heaven my brother. Continue to rest in perpetual peace in a much better place than where you have served with dignity and pride. All of us who were there, and are still here, again thank you for your service, and one day we will meet up with you.
Lieutenant Ray Flores
N.Y.P.D. (retired)
August 21, 2017
Recent LODD Deaths

Police Officer Tamby Yagan
Paterson Police Department, NJ
EOW: April 22, 2018

Deputy Sheriff Casey L. Shoemate
Miller County Sheriff's Office, MO
EOW: April 20, 2018

Sergeant Noel Ramirez
Gilchrist County Sheriff's Office, FL
EOW: April 19, 2018

Deputy Sheriff Taylor Lindsey
Gilchrist County Sheriff's Office, FL
EOW: April 19, 2018

Police Officer Sean McNamee Gannon
Yarmouth Police Department, MA
EOW: April 12, 2018

Patrolman Kevin F. Crossley
Whitesboro Police Department, NY
EOW: April 11, 2018

Police Officer Keith O'Neal Earle
Huntsville Police Department, AL
EOW: April 9, 2018

Corporal Dale Shannon Hallman
Saluda County Sheriff's Office, SC
EOW: April 6, 2018

Police Officer Phillip Lynn Meacham
Hopkinsville Police Department, KY
EOW: March 29, 2018