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CHICAGO — The first two heat-related deaths of the year were reported in Cook County over the weekend when temperatures were above 85 degrees.

Darlene Lipske, 70, of Brookfield, Ill., died Sunday morning at Adventist La Grange Memorial Hospital. The medical examiner found she died of heart disease and heat stress.

Ellean Williams, 69, of Chicago, died Sunday morning at Northwestern Memorial Hospital. The medical examiner’s cause of death was heart disease and heat stress.

Temperatures reached 92 degrees at O’Hare on Friday, 89 degrees on Saturday and 85 degrees on Sunday according to the WGN’s Chicago Weather Center. The National Weather Service had also issued a Heat Advisory on Saturday.

According to the Chicago Sun-Times, Cook County had no heat-related deaths in 2014.