Bisrakh station house officer Ajay Kumar Sharma said the tractor driver had come to supply material at the site last night.
Suddenly, a heavy stone allegedly fell from a height and hit him following which he got critically injured, he said.
He was admitted to a private hospital but died during treatment, the SHO said, adding that the body has been for post-mortem.
His family has alleged negligence on the part of the builder and contractor, saying the National Green Tribunal (NGT) norms were not being followed.
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