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'Nothing Could Stop It': Marvin Heemeyer's Rampage On Granby Detailed In 'TREAD' Documentary

GRANBY, Colo. (CBS4)- On June 4, 2004, a bulldozer turned makeshift tank all but destroyed the down of Granby. It's a day many Coloradans remember and one Luan Akin won't soon forget.

Bulldozer Rampage In Granby, June 4, 2004
June 4, 2004, was the date of Marvin Heemayer's rampage through the town of Granby with an armored bulldozer. The Komatsu D355-A with a 410-horsepower engine destroyed or damaged 12 buildings and caused $5 million damage. CBS4's Copter4 helicopter was the only news helicopter to fly over Granby while the rampage was going on. Granby is a mountain town of 1,600 residents. Heemeyer rammed the 20-cubic-yard blade of his "MK Tank" into several town buildings, including the municipal center. Every round that SWAT teams and police fired at Marvin Heemeyer did little more than pockmark the steel-plated covering of the bulldozer. Heemayer killed himself inside the bulldozer after the 90 minute rampage came to a stop. The bulldozer was towed out of Granby and eventually dismantled. (image credit: CBS)

"It's a personal attachment to it," Akin said. "The thing that alarmed me the most was when we got word that he had pushed his way into the library, city hall building and there had been a lot of kids in that building just moments earlier."

Akin worked for CBS4 at the time as the reporter in Copter4. When word got out an armored bulldozer was mowing down parts of Granby, she was the first to cover the demolition from above.

"What struck me the most, then and now, is that you have this big, powerful machine going super slow motion and nothing could stop it," Akin told CBS4's Kelly Werthmann. "Nothing."

Only Copter4 was overhead at the time of the rampage. As the bulldozer slowly but aggressive took apart the mountain town, Akin kept Colorado informed.

"It really was like a play-by-play. 'And now he's going down here… and he appears to be heading into the propane yard and that's troubling,'" she recalled of her report. "It was clear what he wanted to do."

Bulldozer Rampage In Granby, June 4, 2004
Images of Marvin Heemayer (credit: CBS)

Now her play-by-play and view from the helicopter are playing out in the new documentary "TREAD: The True Story of Marvin Heemeyer." The film dives into the story of Heemeyer, who build the so-called "killdozer," to get back at the people who had somehow wronged him.

"I felt very bad for the town because that was an assault on pretty much everyone in that town," Akin said.

No one was hurt that day, but the rampage only stopped when Heemeyer ended his own life. Nearly two decades later, Akin said she's grateful that she and her Copter4 crew were there.

Bulldozer Rampage In Granby, June 4, 2004
To make the bulldozer, Marvin Heemeyer (not pictured) poured 4 inches of concrete between plates of steel, which he welded onto the Komatsu to armor it. Heemeyer rigged the bulldozer with video cameras equipped with air compressors to blow dust off the lenses. Images of the world outside appeared on monitors inside the enclosed cab so he could guide it without exposing himself, according to the Rocky Mountain News. He stuck three guns, including a .50-caliber rifle, out of portholes bored into the armor to keep authorities at bay. The Komatsu D355-A bulldozer had a 410-horsepower bulldozer engine and it was primed, fueled and protected by steel and concrete. It destroyed or damaged 12 buildings and caused $5 million damage. (image credit: CBS)

"I'm glad we three in the helicopter were able to do our job that day, just the way it should've been done," she said.

Akin said she will likely see the documentary, now showing in a handful of Colorado theaters and on demand Feb. 28.

LINK: TREAD: The True Story of Marvin Heemeyer

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