The 63-year-old man was working around 9 a.m. in the 3500 block of West Fillmore Street when he suffered an injury, Chicago police said.
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He was pronounced dead at the scene.
The man was working at a city pumping station in Homan Square near Central Park Avenue, according to Chicago Fire Department officials. He died by probable electrocution.
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No one else was injured, authorities said.
Chicago police continue to conduct a death investigation.
The Chicago Water Department issued a statement about the death:
"The Department of Water Management regards the safety of our employees and contractors as our highest priority. All appropriate protocols and regulations will be followed in investigating the occurrence at the Central Park Pumping Station today. We have deployed a DWM safety investigator to do a preliminary examination of the situation."
The U.S. Department of Labor is also investigating the death.
No further information was immediately available.