He was found unresponsive at 3 p.m. and could not be revived by the Hamilton Fire Department, according to a police report.
MORE: Emergency crews pull truck from Hamilton canal
Ed Ratliff, 63, of Hamilton, said he was working with Robertson when the incident occurred, but was on the ground.
Robertson’s head contacted a power line while he was repairing bricks on the chimney, he said.
Ratliff, who had known Robertson for more than a decade, called him “a very good guy.”
Ratliff told the Journal-News he was having trouble getting the memory of the accident out of his mind.