Sherman Fire Chief Danny Jones said around 9:30 a.m. Wednesday ground crew members were lifting the flag pole in front of the apartment complex, when it fell over onto a power line.
One of those workers died at Wilson N Jones hospital. The other two were taken to a Plano hospital's burn unit. They are in critical condition.
"So I was actually in my car in the parking lot and I hear a zzzz sound and I look over to my right and I see a big splash, a big cloud of blue," KXII-TV Morning Producer Adrian Torres said.
Torres lives at River Ranch Apartments, and had just arrived home from work.
"And then I saw another big cloud of blue, and then I look over and I can see some guys knee on the floor, so then that's when i got up and went over there and some other lady went running over there and we saw they were just laying on the floor," Torres said.
"I stood back because we saw the pole was touching the cable still and it was still touching one of the guys feet, still looked like it so we stood back," Torres said.
Officials say the three were trying to lift the pole from the ground when the wind caught it and it hit this power line.
"First off, our hearts and prayers go out to the people injured but there were three people injured on an electrocution with a customer with our primary voltage," ONCOR Area Manager Todd Thompson said.
No names of the victims have been released pending notification of their families, Jones said.