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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.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

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. He destroyed multiple buildings in town, caused millions of dollars in damage, and died by suicide after the vehicle became stuck. No other people were killed or injured.

Background

Marvin Heemeyer was a Granby resident involved in disputes with local officials and businesses before the attack. Reporting describes the rampage as a deliberate, planned act using a heavily modified bulldozer.

The rampage

On 4 June 2004, Heemeyer drove the armored bulldozer through Granby, damaging buildings across the town. Accounts identify 13 destroyed or heavily damaged structures, including the town hall, a bank, a newspaper office, and a former mayor’s home.

Aftermath

The bulldozer became stuck and the incident ended after roughly two hours. Heemeyer died by suicide, and no one else was killed or injured.

Legacy

The incident received broad news coverage and later documentaries and retrospective reporting. It is commonly cited as one of the most unusual acts of property destruction in recent U.S. crime history.

Key facts

  • The incident involved a modified bulldozer that Heemeyer had armored with steel and concrete.
  • Heemeyer damaged 13 buildings, including the town hall and other commercial and municipal structures.
  • The rampage ended when the bulldozer became stuck near a hardware store.
  • Heemeyer died by suicide inside the vehicle after it was immobilized.
  • No other people were killed or injured, in part because residents were evacuated.
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Canadian context

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]

Frequently asked questions

Who carried out the Killdozer incident?
Marvin Heemeyer carried it out in Granby, Colorado, using an armored bulldozer.
When did Killdozer happen?
It happened on 4 June 2004.
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.
How did the incident end?
The bulldozer became stuck, and Heemeyer then died by suicide inside it.
Why is it called Killdozer?
The name refers to the armored bulldozer used in the attack; it is a media nickname rather than the vehicle’s original name.

References

  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.