The incident happened around 4:15 p.m. Friday, April 19, in Glen Head.
A 34-year-old landscaper was working in a tree at the site, cutting a branch with a chainsaw when a nearby powerline electrocuted him, Nassau County Police said.
The man succumbed to his injuries at the scene and was pronounced deceased by a Nassau County Police Medic.
His identity has not yet been released.
A 51-year-old male coworker was injured while attempting to render aid to the victim. He was transported to a local hospital with non-life-threatening injuries.
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