The unfortunate chap was alone on his property at the time. While one has to question the wisdom of undertaking a demolition project with no-one on hand in the event of a mishap, a neighbor happened to witness this 'mishap' and immediately summoned help. Hydraulic rams and high pressure air bags were too late to stop fate. Paramedics pronounced him dead at the scene.
In the unequal contest between flesh and stone, the stone always wins.
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Reference: York Evening Press, thepress.co.uk
"Speaking to the press, a neighbor described the accident as 'unspeakable.'"