This same thunderstorm also caused a tent to collapse, called The Dome, in the suburban Rosemont and a temporary evacuation of the music festival Lollapalooza.
Wood Dale police could not immediately be reached for more details.
Wood Dale Deputy Police Chief Mike Rivas told the Chicago Tribune that 17 to 20 more people were taken to area hospitals when the tent collapsed.
The fatality was identified as Wood Dale resident Steven Nincic, 35.
Witnesses said a strong wind gust picked the tent up and slammed it down to the ground on some of the crowd.
It occurred at 2:35 p.m. Connecticut when a storm with excessive winds and hail swept by means of the world on the Prairie Fest in Wood Dale, Illinois, the Chicago Tribune reported.
Sunday was the last day of the four-day festival, which includes live music, a carnival and fireworks, according to the city. Chairs, tables and other debris were strewn on the grass near where the tent collapsed.
“The tarp landed on several people, and rescuers started cutting holes to get them out”, said Anderson, who said she saw at least six ambulances and eight fire trucks at the scene. Thousands of people attend the event and there were around 5,000 there on Saturday night, Woods said. Concertgoers retreated from Grant Park to 3 pre-established shelters, however the festivals gates quickly reopened.