Marvin Heemeyer's Audio Tapes (Recorded in 2004)

Martin Heemeyer made international headlines on June 4th 2004, when he, as the result of a zoning dispute, took to a homemade, reinforced, armoured Komatsu D355A bulldozer (which the media has since dubbed the "Killdozer"), and began demolishing buildings in Granby, Colorado, (including both the Town Hall and the house of the former mayor). Ultimately, after his bulldozer became stuck in a building's basement after trying to demolish it, Heemeyer drew a .357-caliber handgun and shot himself in the head.

The zoning dispute began in 2001, when construction was approved for a cement manufacturing plant in a lot near Heemeyer's muffler shop (said particular lot being used frequently by Heemeyer to get to and from his business). He failed multiple times to appeal the decision, and, adding fuel to the fire, was later fined $2500 for having junk cars on his property, and for not being connected to the sewer line. In a last ditch effort, he tried petitioning the city, although was unsuccessful. Admitting defeat, he decided to purchase a bulldozer,  with the intention of creating an alternative route to his shop, although, this too was rejected by city officials. It is at this point that Heemeyer cracked, and began work on his "Killdozer".

Over the course of 1 and a half years, Heemeyer reinforced his bulldozer using concrete and steel. In addition to armouring the bulldozer, he also installed several video cameras, which he linked up to a pair of monitors inside. His rampage took out 13 buildings in total, starting with the very building that had sparked the whole dispute; the cement factory. Despite efforts from police, none of their weapons were able to penetrate the bulldozer's armour. The final building destroyed was Gambles hardware store, in the basement of which the bulldozer became stuck, as previously mentioned.

Shortly before embarking on his rampage, Heemeyer recorded a series of audio tapes outlining his motives (totalling roughly 2 and a half hours, the last recording of which was created just 13 days beforehand) and mailed them to his brother in South Dakota, who in turn handed them over to the FBI. The FBI then turned them over to the Grand County Sheriff's Office, who are said to have released them, although all that can be found of them online today are small segments that were broadcast during news reports and TV shows regarding the incident. It is unknown exactly as to the scale of said "release" (ie. to whom the recordings were made available to, and in what quantities).