Brenda Turcotte Laberge says she wants to know why her 61-year-old husband was the only one killed in the storm that battered Goderich with 280 km/h winds.
Normand Laberge died on the job at the Sifto salt mine, but the company says other employees who were working at the time survived.
Turcotte Laberge says her husband was manning the boom, an extendable arm that loads freight onto ships, when the twister hit and pinned him under the rubble.
She says he always kept a close watch on the weather while working and had reported seeing a bad storm on the horizon.
A spokeswoman for Sifto's parent company Compass Minerals says the mine was being evacuated but Laberge wasn't able to escape.
Kelly Barton says the majority of the mine's employees work underground but Laberge was up high because he oversees the loading of ships.
Paola Loriggio, The Canadian Press