The Harris County Precinct 4 Constable's Office originally reported the 45-year-old man was shocked while working in the 13500 block of Cahill Drive.
Pct. 4 said preliminary reports indicated a tree branch may have hit the power line.
The man was taken to the hospital, where he was pronounced dead. Wednesday afternoon Pct. 4 said the man died from a medical emergency. No other details were released on the incident.
Officials confirmed the man worked for a tree service company.
An investigation remains ongoing.