The person had complained of the heat and breathing difficulties and died after paramedics had arrived.
A government heat warning is in place for the region, but meteorologists are forecasting a drop in temperatures at the end of the week.
Firefighters are going door-to-door to check on at-risk residents in Montreal and health officials have set up drop-in cooling centers in the city to offer respite from sizzling temperatures.
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The extreme heat warning has also caused the Toronto Blue Jays to close the roof at Rogers Centre for Saturday's game against the Detroit Tigers as a precaution.
The adopted criteria includes a daytime temperature of 29 degrees Celsius or higher and nighttime temperature of 16 degrees or higher or a humidex of 36 degrees Celsius or higher.
Drouin said there have been thousands of home visits and that officials want to avoid the results of an extended heat period in 2010, when 106 people died in the Montreal area.
So far the heat has only broken one record in Toronto - on Friday, Pearson airport hit a high of 35.4 degrees. You haven't felt anything yet, according to Environment Canada.
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But a cold front should pass through on Friday, making conditions more comfortable.
"Usually when we get heat events it only lasts two or four days", Ms. Hobelman said.
Phillips said that humidex values, some approaching the mid 40s, have made the heat particularly hard to take for many, especially these last few days. "And also do not forget to make sure you don't leave any people or pets in your vehicle, as temperatures will rise dramatically within minutes".
Dr. Melissa Genereux, head of public health in the Eastern Townships, told a news conference Wednesday the victims are all adults - either seniors or people suffering from chronic illness.
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