United States Department of Justice - Federal Bureau of Investigation, U.S. Government
End of Watch Wednesday, March 5, 2025
Add to My HeroesDennis M. Wagner, Jr.
Supervisory Special Agent Dennis Wagner died as a result of cancer that he developed following his assignment to the search and recovery efforts at the Flight 93 crash site in Shanksville, Pennsylvania, following the 9/11 Terrorist Attacks.
Supervisory Special Agent Wagner was a United States Army Reserves Iraq War veteran and served with the United States Department of Justice - Federal Bureau of Investigation for 20 years. He was survived by his wife, daughter, and son.
The 9/11 Terrorist Attacks
On the morning of September 11th, 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 four hijacked planes into the World Trade Center towers in New York City, the Pentagon in Arlington, Virginia, and a field near Shanksville, Pennsylvania.
After the impact of the first plane into the World Trade Center's North Tower, 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 South Tower unexpectedly collapsed as a result of the intense fire caused by the impact. The North Tower collapsed a short time later. Seventy-two 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 on 9/11.
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 on 9/11.
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 9th, 2005, all of the public safety officers killed on September 11th, 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 1st, 2011, members of the United States military conducted a raid on a compound in Abbottabad, Pakistan, and killed Osama bin Laden.
Please click here to visit the memorials of all of the law enforcement officers who have died as a result of the 9/11 Terrorist Attacks.
Bio
- Age 60
- Tour 20 years
- Badge Not available
- Military Veteran
Incident Details
- Cause 9/11 related illness
- Location Pennsylvania
- Incident Date Tuesday, September 11, 2001
- Weapon Aircraft; Passenger jet
- Offender 19 suicide attackers
Most Recent Reflection
View all 32 ReflectionsI was Dennis’s supervisor on the D-1 squad in Chicago, 1996-2000. He was a dedicated and talented Agent who knew Chicago well. He made many contributions to the squad’s success during those years. Also a dry sense of humor (Operation Grim Reefer…the people on the squad will get it). I’m not surprised to learn of his painstaking Evidence Response Team work at the crash site. That was Dennis. I was saddened to learn of his passing, and I know his squad mates are mourning his loss as well. May God bless his family. RIP Dennis.
Bob Casey
FBI retired
July 6, 2025
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