Provincial police say the man stopped around 4:30 p.m. February 10 to check on a crash just west of Chepstow in Greenock Township.
A vehicle that had ended up in the ditch had caused hydro pole guide wires to fall across the road.
Police say a second vehicle drove over the downed wires causing a hydro pole to break and hit the man.
The man, 31-year-old Derrick Walter of Walkerton, died of his injuries at the scene.
Police are making an appeal for witnesses to come forward with information.