Bryan McAllister’s personal reference notebook
September 12, 2026Short & citedBlog
Civic Viewpoint.
A quiet encyclopedia with a personal desk
Civic Brief • Incidents

Killdozer

Killdozer is the name commonly used for the 4 June 2004 bulldozer rampage in Granby, Colorado, carried out by Marvin Heemeyer in a heavily armored Komatsu D355A bulldozer.

Updated September 12, 20261 min readCited sources

Killdozer is the name for the 4 June 2004 bulldozer rampage in Granby, Colorado, carried out by Marvin Heemeyer. He used an armored Komatsu D355A bulldozer to destroy multiple buildings, causing millions in damage, before dying by suicide.

What it is

The Killdozer incident involved a heavily modified bulldozer that Heemeyer had armored with steel and concrete. He drove it through Granby, damaging 13 buildings including the town hall, a bank, and a newspaper office. The rampage lasted about two hours and ended when the vehicle became stuck near a hardware store.

Key details

Heemeyer acted after disputes with local officials and businesses. He died by suicide inside the bulldozer after it was immobilized. No other people were killed or injured, in part because residents were evacuated. The damage was estimated between US$5 million and US$7 million.

Legacy

The event drew broad news coverage and later documentaries. It is often cited as one of the most unusual acts of property destruction in recent US crime history. In Canada, the incident is occasionally covered in media and true-crime programming as an unusual example of a rampage involving property destruction rather than mass casualties.

In short

  • Marvin Heemeyer used an armored bulldozer to destroy 13 buildings in Granby, Colorado.
  • No bystanders were killed or injured.
  • Heemeyer died by suicide after the bulldozer became stuck.
  • The incident is widely known as the Killdozer rampage.
Canadian angle

The incident is occasionally covered in Canadian media and true-crime programming as an unusual example of a U.S. rampage involving property destruction rather than mass casualties.[1]

Quick questions

Who carried out the Killdozer incident?
Marvin Heemeyer carried it out in Granby, Colorado, using an armored bulldozer.
How many buildings were damaged?
Reporting commonly says 13 buildings were destroyed or heavily damaged.
Were any bystanders killed?
No. Reports say no other people were killed or injured.

Sources

  1. KUNChttps://www.kunc.org/news/2020-02-20/granbys-bulldozer-rampage-captured-the-worlds-attention-now-its-a-documentary
    Supports: Identifies the event as the 2004 Granby bulldozer rampage, describes Heemeyer using an armored bulldozer, and notes the self-inflicted gunshot wound.
  2. Wikipediahttps://en.wikipedia.org/wiki/Killdozer
    Supports: Provides the date, sequence of destruction, no other casualties, and the vehicle ending stuck in a hardware store.
  3. Denver7https://www.denver7.com/news/local-news/killdozer-20-years-later-how-and-why-a-man-went-on-a-rampage-through-granby-in-an-armored-bulldozer
    Supports: States the incident date, the armored bulldozer, 13 buildings destroyed, and damage exceeding $5 million.
  4. Sky-Hi Newshttps://www.skyhinews.com/news/photos-killdozer-rampage-marks-22nd-anniversary/
    Supports: Gives the rampage date, vehicle model, ending when it became stuck, Heemeyer’s suicide, and damage near $7 million.
  5. HowStuffWorkshttps://history.howstuffworks.com/american-history/killdozer.htm
    Supports: Summarizes the rampage, the number of buildings demolished, and that no one was killed except Heemeyer.