Marvin John Heemeyer (October 28, 1951 – June 4, 2004) was an American skilled welder and owner of an automobile muffler shop. On June 4, 2004, frustrated over a failed zoning dispute, Heemeyer used a Komatsu D355A bulldozer which he had modified with armor in the forms of steel and concrete to demolish the town hall, a former mayor’s home and other buildings in Granby, Colorado. The rampage ended when the bulldozer’s engine overheated due to a combination of the armor’s weight and insulating properties. Heemeyer killed himself with a .357 handgun.
Heemeyer used an armor-plated Komatsu D355A bulldozer to destroy 13 buildings in Granby, Colorado
Heemeyer had been feuding with officials and individuals in Granby, particularly over fines for violating city ordinances and a zoning dispute regarding a concrete factory constructed opposite his muffler shop that destroyed his business.
In the aftermath, some in the media reported a few people in the county suggested turning Heemeyer’s bulldozer into a tourist attraction. However, such a course of action was never seriously considered. Almost immediately following the rampage, the District Attorney’s Office filed an action to have the bulldozer, and related weapons, declared public nuisances, and subject to forfeiture under Colorado law. With no opposition, the Grand County District Court approved the action, and ultimately the property was destroyed.
Although the town had mixed reactions to Heemeyer’s act, his actions spurred a new feeling of closeness among the residents in Granby, who organized fundraisers to help rebuild the property he damaged.
On April 19, 2005, it was announced that Killdozer was being taken apart for scrap metal. Individual pieces of Killdozer would be dispersed to many separate scrap yards to prevent admirers of Heemeyer from taking souvenirs.