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Thousands of spectators gather in Chicago to cheer on their friends and family during the Bank of America Chicago Marathon on Oct. 13, 2019.

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Supporters hold signs for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.
Supporters hold signs for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.

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Spectators cheer on the runners during the Bank of America Chicago Marathon, Sunday, Oct. 13, 2019.
Spectators cheer on the runners during the Bank of America Chicago Marathon, Sunday, Oct. 13, 2019.

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Matt Rardin, of Lakeview, holds a sign of support during the Bank of America Chicago Marathon on Oct. 13, 2019.
Matt Rardin, of Lakeview, holds a sign of support during the Bank of America Chicago Marathon on Oct. 13, 2019.

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Spectators hold signs during the Bank of America Chicago Marathon on Oct. 13, 2019.
Spectators hold signs during the Bank of America Chicago Marathon on Oct. 13, 2019.

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A sign hangs on a fence near mile marker 8 of the Bank of America Chicago Marathon, Oct. 13, 2019, in Chicago.
A sign hangs on a fence near mile marker 8 of the Bank of America Chicago Marathon, Oct. 13, 2019, in Chicago.

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A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.
A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.

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Miranda Dopp, of Iowa City, Iowa, waves a sign during the Bank of America Chicago Marathon on Oct. 13, 2019.
Miranda Dopp, of Iowa City, Iowa, waves a sign during the Bank of America Chicago Marathon on Oct. 13, 2019.

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Supporters hold signs for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.
Supporters hold signs for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.

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Supporters hold signs for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.
Supporters hold signs for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.

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Jennifer Edgecomb holds a sign pointing to her 15-year-old dog Floyd near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.
Jennifer Edgecomb holds a sign pointing to her 15-year-old dog Floyd near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.

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A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.
A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.

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Supporters hold signs for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.
Supporters hold signs for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.

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Jeff Seger, of Lakeview, holds a sign of support during the Bank of America Chicago Marathon on Oct. 13, 2019.
Jeff Seger, of Lakeview, holds a sign of support during the Bank of America Chicago Marathon on Oct. 13, 2019.

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A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon Oct. 13, 2019, in Chicago.
A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon Oct. 13, 2019, in Chicago.

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A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.
A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.

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Supporters hold signs for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.
Supporters hold signs for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.

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A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.
A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.

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A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon Sunday, Oct. 13, 2019, in Chicago. (Erin Hooley/baiduhai)
A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon Sunday, Oct. 13, 2019, in Chicago. (Erin Hooley/baiduhai)

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Miriam Perez, of Edgewater, holds a sign that says “Move your butt, no excuses” during the Bank of America Chicago Marathon on Oct. 13, 2019.

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Supporters hold signs near mile marker 8 for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.
Supporters hold signs near mile marker 8 for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.

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A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.
A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.

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A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.
A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.

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Supporters hold signs for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.
Supporters hold signs for runners during the Bank of America Chicago Marathon on Oct. 13, 2019.

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A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.
A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.

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A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.
A spectator holds a sign near mile marker 8 of the Bank of America Chicago Marathon on Oct. 13, 2019, in Chicago.

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Spectators wave signs in Chinatown during the Bank of America Chicago Marathon, Oct. 13, 2019.
Spectators wave signs in Chinatown during the Bank of America Chicago Marathon, Oct. 13, 2019.